Why is there similarity in Quran?

A kind of parallel similarity is imposed on Quran. These similar verses are expressed according to common styles of Arab and are without complexity.
Main similarity is completely natural because this kind of similarity created due to expression of deep meanings.
Quran states
إِنَّ اللَّهَ لَا يَسْتَحْيِي أَن يَضْرِبَ مَثَلًا مَّا بَعُوضَةً فَمَا فَوْقَهَا ۚ فَأَمَّا الَّذِينَ آمَنُوا فَيَعْلَمُونَ أَنَّهُ الْحَقُّ مِن رَّبِّهِمْ ۖ وَأَمَّا الَّذِينَ كَفَرُوا فَيَقُولُونَ مَاذَا أَرَادَ اللَّهُ بِهَٰذَا مَثَلًا ۘ يُضِلُّ بِهِ كَثِيرًا وَيَهْدِي بِهِ كَثِيرًا ۚ وَمَا يُضِلُّ بِهِ إِلَّا الْفَاسِقِينَ
Allah disdains not to use the similitude of things, lowest as well as highest. Those who believe know that it is truth from their Lord; but those who reject Faith say: "What means Allah by this similitude?" By it He causes many to stray, and many He leads into the right path; but He causes not to stray, except those who forsake (the path).
هُوَ الَّذِي أَنزَلَ عَلَيْكَ الْكِتَابَ مِنْهُ آيَاتٌ مُّحْكَمَاتٌ هُنَّ أُمُّ الْكِتَابِ وَأُخَرُ مُتَشَابِهَاتٌ ۖ فَأَمَّا الَّذِينَ فِي قُلُوبِهِمْ زَيْغٌ فَيَتَّبِعُونَ مَا تَشَابَهَ مِنْهُ ابْتِغَاءَ الْفِتْنَةِ وَابْتِغَاءَ تَأْوِيلِهِ ۗ وَمَا يَعْلَمُ تَأْوِيلَهُ إِلَّا اللَّهُ ۗ وَالرَّاسِخُونَ فِي الْعِلْمِ يَقُولُونَ آمَنَّا بِهِ كُلٌّ مِّنْ عِندِ رَبِّنَا ۗ وَمَا يَذَّكَّرُ إِلَّا أُولُو الْأَلْبَابِ
He it is Who has sent down to thee the Book: In it are verses basic or fundamental (of established meaning); they are the foundation of the Book: others are allegorical. But those in whose hearts is perversity follow the part thereof that is allegorical, seeking discord, and searching for its hidden meanings, but no one knows its hidden meanings except Allah. And those who are firmly grounded in knowledge say: "We believe in the Book; the whole of it is from our Lord:" and none will grasp the Message except men of understanding.
Light is the most exalted creature in world and Quran states
اللَّهُ نُورُ السَّمَاوَاتِ وَالْأَرْضِ ۚ مَثَلُ نُورِهِ كَمِشْكَاةٍ فِيهَا مِصْبَاحٌ ۖ الْمِصْبَاحُ فِي زُجَاجَةٍ ۖ الزُّجَاجَةُ كَأَنَّهَا كَوْكَبٌ دُرِّيٌّ يُوقَدُ مِن شَجَرَةٍ مُّبَارَكَةٍ زَيْتُونَةٍ لَّا شَرْقِيَّةٍ وَلَا غَرْبِيَّةٍ يَكَادُ زَيْتُهَا يُضِيءُ وَلَوْ لَمْ تَمْسَسْهُ نَارٌ ۚ نُّورٌ عَلَىٰ نُورٍ ۗ يَهْدِي اللَّهُ لِنُورِهِ مَن يَشَاءُ ۚ وَيَضْرِبُ اللَّهُ الْأَمْثَالَ لِلنَّاسِ ۗ وَاللَّهُ بِكُلِّ شَيْءٍ عَلِيمٌ
Allah is the Light of the heavens and the earth. The Parable of His Light is as if there were a Niche and within it a Lamp: the Lamp enclosed in Glass: the glass as it were a brilliant star: Lit from a blessed Tree, an Olive, neither of the east nor of the west, whose oil is well-nigh luminous, though fire scarce touched it: Light upon Light! Allah doth guide whom He will to His Light: Allah doth set forth Parables for men: and Allah doth know all things.
The religion has not denied body and Quran states
اطِرُ السَّمَاوَاتِ وَالْأَرْضِ ۚ جَعَلَ لَكُم مِّنْ أَنفُسِكُمْ أَزْوَاجًا وَمِنَ الْأَنْعَامِ أَزْوَاجًا ۖ يَذْرَؤُكُمْ فِيهِ ۚ لَيْسَ كَمِثْلِهِ شَيْءٌ ۖ وَهُوَ السَّمِيعُ الْبَصِيرُ
He is) the Creator of the heavens and the earth: He has made for you pairs from among yourselves, and pairs among cattle: by this means does He multiply you: there is nothing whatever like unto Him, and He is the One that hears and sees (all things).
لَّا تُدْرِكُهُ الْأَبْصَارُ وَهُوَ يُدْرِكُ الْأَبْصَارَ ۖ وَهُوَ اللَّطِيفُ الْخَبِيرُ
No vision can grasp Him, but His grasp is over all vision: He is above all comprehension, yet is acquainted with all things.
God is in a world that is more exalted than the earth and Quran states that God is not in a specific orientation;
وَلِلَّهِ الْمَشْرِقُ وَالْمَغْرِبُ ۚ فَأَيْنَمَا تُوَلُّوا فَثَمَّ وَجْهُ اللَّهِ ۚ إِنَّ اللَّهَ وَاسِعٌ عَلِيمٌ
To Allah belong the east and the West: Whithersoever ye turn, there is the presence of Allah. For Allah is all-Pervading, all-Knowing.
Quran states
وَإِن مِّن شَيْءٍ إِلَّا عِندَنَا خَزَائِنُهُ وَمَا نُنَزِّلُهُ إِلَّا بِقَدَرٍ مَّعْلُومٍ
And there is not a thing but its (sources and) treasures (inexhaustible) are with Us; but We only send down thereof in due and ascertainable measures.
The following verses talk about the communication of God;
وَجَاءَ رَبُّكَ وَالْمَلَكُ صَفًّا صَفًّا
And thy Lord cometh, and His angels, rank upon rank.
لْ يَنظُرُونَ إِلَّا أَن يَأْتِيَهُمُ اللَّهُ فِي ظُلَلٍ مِّنَ الْغَمَامِ وَالْمَلَائِكَةُ وَقُضِيَ الْأَمْرُ ۚ وَإِلَى اللَّهِ تُرْجَعُ الْأُمُورُ
Will they wait until Allah comes to them in canopies of clouds, with angels (in His train) and the question is (thus) settled? but to Allah do all questions go back (for decision).
وَاسْأَلِ الْقَرْيَةَ الَّتِي كُنَّا فِيهَا وَالْعِيرَ الَّتِي أَقْبَلْنَا فِيهَا ۖ وَإِنَّا لَصَادِقُونَ
Ask at the town where we have been and the caravan in which we returned, and (you will find) we are indeed telling the truth.
وَلَقَدْ أَرْسَلْنَا رُسُلًا مِّن قَبْلِكَ مِنْهُم مَّن قَصَصْنَا عَلَيْكَ وَمِنْهُم مَّن لَّمْ نَقْصُصْ عَلَيْكَ ۗ وَمَا كَانَ لِرَسُولٍ أَن يَأْتِيَ بِآيَةٍ إِلَّا بِإِذْنِ اللَّهِ ۚ فَإِذَا جَاءَ أَمْرُ اللَّهِ قُضِيَ بِالْحَقِّ وَخَسِرَ هُنَالِكَ الْمُبْطِلُونَ
We did aforetime send messengers before thee: of them there are some whose story We have related to thee, and some whose story We have not related to thee. It was not (possible) for any messenger to bring a sign except by the leave of Allah: but when the Command of Allah issued, the matter was decided in truth and justice, and there perished, there and then those who stood on Falsehoods.
هَلْ يَنظُرُونَ إِلَّا أَن تَأْتِيَهُمُ الْمَلَائِكَةُ أَوْ يَأْتِيَ رَبُّكَ أَوْ يَأْتِيَ بَعْضُ آيَاتِ رَبِّكَ ۗ يَوْمَ يَأْتِي بَعْضُ آيَاتِ رَبِّكَ لَا يَنفَعُ نَفْسًا إِيمَانُهَا لَمْ تَكُنْ آمَنَتْ مِن قَبْلُ أَوْ كَسَبَتْ فِي إِيمَانِهَا خَيْرًا ۗ قُلِ انتَظِرُوا إِنَّا مُنتَظِرُونَ
Are they waiting to see if the angels come to them, or thy Lord (Himself), or certain of the signs of thy Lord! the day that certain of the signs of thy Lord do come, no good will it do to a soul to believe in them then if it believed not before nor earned righteousness through its faith. Say: "Wait ye: we too are waiting''.
هَلْ يَنظُرُونَ إِلَّا أَن تَأْتِيَهُمُ الْمَلَائِكَةُ أَوْ يَأْتِيَ أَمْرُ رَبِّكَ ۚ كَذَٰلِكَ فَعَلَ الَّذِينَ مِن قَبْلِهِمْ ۚ وَمَا ظَلَمَهُمُ اللَّهُ وَلَٰكِن كَانُوا أَنفُسَهُمْ يَظْلِمُونَ
Do the (ungodly) wait until the angels come to them, or there comes the Command of thy Lord (for their doom)? So did those who went before them. But Allah wronged them not: nay, they wronged their own souls.
للَّهُ يَتَوَفَّى الْأَنفُسَ حِينَ مَوْتِهَا وَالَّتِي لَمْ تَمُتْ فِي مَنَامِهَا ۖ فَيُمْسِكُ الَّتِي قَضَىٰ عَلَيْهَا الْمَوْتَ وَيُرْسِلُ الْأُخْرَىٰ إِلَىٰ أَجَلٍ مُّسَمًّى ۚ إِنَّ فِي ذَٰلِكَ لَآيَاتٍ لِّقَوْمٍ يَتَفَكَّرُونَ
It is Allah that takes the souls (of men) at death; and those that die not (He takes) during their sleep: those on whom He has passed the decree of death, He keeps back (from returning to life), but the rest He sends (to their bodies) for a term appointed verily in this are Signs for those who reflect.
قُلْ يَتَوَفَّاكُم مَّلَكُ الْمَوْتِ الَّذِي وُكِّلَ بِكُمْ ثُمَّ إِلَىٰ رَبِّكُمْ تُرْجَعُونَ
Say: "The Angel of Death, put in charge of you, will (duly) take your souls: then shall ye be brought back to your Lord''.
The verses of Quran invites human to get object lesson from past;
أَفَلَا يَنظُرُونَ إِلَى الْإِبِلِ كَيْفَ خُلِقَتْ
Do they not look at the Camels, how they are made.
The word '' seeing'' in the following verse means waiting;
مَا يَنظُرُونَ إِلَّا صَيْحَةً وَاحِدَةً تَأْخُذُهُمْ وَهُمْ يَخِصِّمُونَ
They will not (have to) wait for aught but a single Blast: it will seize them while they are yet disputing among themselves.
The word '' seeing'' in the following verse means observing with eyes;
وَإِنِّي مُرْسِلَةٌ إِلَيْهِم بِهَدِيَّةٍ فَنَاظِرَةٌ بِمَ يَرْجِعُ الْمُرْسَلُونَ
But I am going to send him a present, and (wait) to see with what (answer) return (my) ambassadors.
Quran sates about seeing
لَّا تُدْرِكُهُ الْأَبْصَارُ وَهُوَ يُدْرِكُ الْأَبْصَارَ ۖ وَهُوَ اللَّطِيفُ الْخَبِيرُ
No vision can grasp Him, but His grasp is over all vision: He is above all comprehension, yet is acquainted with all things.
وَلَمَّا جَاءَ مُوسَىٰ لِمِيقَاتِنَا وَكَلَّمَهُ رَبُّهُ قَالَ رَبِّ أَرِنِي أَنظُرْ إِلَيْكَ ۚ قَالَ لَن تَرَانِي وَلَٰكِنِ انظُرْ إِلَى الْجَبَلِ فَإِنِ اسْتَقَرَّ مَكَانَهُ فَسَوْفَ تَرَانِي ۚ فَلَمَّا تَجَلَّىٰ رَبُّهُ لِلْجَبَلِ جَعَلَهُ دَكًّا وَخَرَّ مُوسَىٰ صَعِقًا ۚ فَلَمَّا أَفَاقَ قَالَ سُبْحَانَكَ تُبْتُ إِلَيْكَ وَأَنَا أَوَّلُ الْمُؤْمِنِينَ
When Moses came to the place appointed by Us, and his Lord addressed him, He said: "O my Lord! show (Thyself) to me, that I may look upon thee." Allah said: "By no means canst thou see Me (direct); But look upon the mount; if it abide in its place, then shalt thou see Me." When his Lord manifested His glory on the Mount, He made it as dust. And Moses fell down in a swoon. When he recovered his senses he said: "Glory be to Thee! to Thee I turn in repentance, and I am the first to believe''.
يَسْأَلُكَ أَهْلُ الْكِتَابِ أَن تُنَزِّلَ عَلَيْهِمْ كِتَابًا مِّنَ السَّمَاءِ ۚ فَقَدْ سَأَلُوا مُوسَىٰ أَكْبَرَ مِن ذَٰلِكَ فَقَالُوا أَرِنَا اللَّهَ جَهْرَةً فَأَخَذَتْهُمُ الصَّاعِقَةُ بِظُلْمِهِمْ ۚ ثُمَّ اتَّخَذُوا الْعِجْلَ مِن بَعْدِ مَا جَاءَتْهُمُ الْبَيِّنَاتُ فَعَفَوْنَا عَن ذَٰلِكَ ۚ وَآتَيْنَا مُوسَىٰ سُلْطَانًا مُّبِينًا
The people of the Book ask thee to cause a book to descend to them from heaven: Indeed they asked Moses for an even greater (miracle), for they said: "Show us Allah in public," but they were dazed for their presumption, with thunder and lightning. Yet they worshipped the calf even after clear signs had come to them; even so we forgave them; and gave Moses manifest proofs of authority''.
Quran states
وَإِذْ قُلْتُمْ يَا مُوسَىٰ لَن نُّؤْمِنَ لَكَ حَتَّىٰ نَرَى اللَّهَ جَهْرَةً فَأَخَذَتْكُمُ الصَّاعِقَةُ وَأَنتُمْ تَنظُرُونَ
And remember ye said: "O Moses! We shall never believe in thee until we see Allah manifestly," but ye were dazed with thunder and lighting even as ye looked on.
Some persons imagine that God has body organs such as foot, eye, ears and… and have resorted to some verses;
وَقَالَتِ الْيَهُودُ يَدُ اللَّهِ مَغْلُولَةٌ ۚ غُلَّتْ أَيْدِيهِمْ وَلُعِنُوا بِمَا قَالُوا ۘ بَلْ يَدَاهُ مَبْسُوطَتَانِ يُنفِقُ كَيْفَ يَشَاءُ ۚ وَلَيَزِيدَنَّ كَثِيرًا مِّنْهُم مَّا أُنزِلَ إِلَيْكَ مِن رَّبِّكَ طُغْيَانًا وَكُفْرًا ۚ وَأَلْقَيْنَا بَيْنَهُمُ الْعَدَاوَةَ وَالْبَغْضَاءَ إِلَىٰ يَوْمِ الْقِيَامَةِ ۚ كُلَّمَا أَوْقَدُوا نَارًا لِّلْحَرْبِ أَطْفَأَهَا اللَّهُ ۚ وَيَسْعَوْنَ فِي الْأَرْضِ فَسَادًا ۚ وَاللَّهُ لَا يُحِبُّ الْمُفْسِدِينَ
The Jews say: "Allah´s hand is tied up." Be their hands tied up and be they accursed for the (blasphemy) they utter. Nay, both His hands are widely outstretched: He giveth and spendeth (of His bounty) as He pleaseth. But the revelation that cometh to thee from Allah increaseth in most of them their obstinate rebellion and blasphemy. Amongst them we have placed enmity and hatred till the Day of Judgment. Every time they kindle the fire of war, Allah doth extinguish it; but they (ever) strive to do mischief on earth. And Allah loveth not those who do mischief.
وَلَا تَجْعَلْ يَدَكَ مَغْلُولَةً إِلَىٰ عُنُقِكَ وَلَا تَبْسُطْهَا كُلَّ الْبَسْطِ فَتَقْعُدَ مَلُومًا مَّحْسُورًا
Make not thy hand tied (like a niggard´s) to thy neck, nor stretch it forth to its utmost reach, so that thou become blameworthy and destitute.
لَّقَدْ سَمِعَ اللَّهُ قَوْلَ الَّذِينَ قَالُوا إِنَّ اللَّهَ فَقِيرٌ وَنَحْنُ أَغْنِيَاءُ ۘ سَنَكْتُبُ مَا قَالُوا وَقَتْلَهُمُ الْأَنبِيَاءَ بِغَيْرِ حَقٍّ وَنَقُولُ ذُوقُوا عَذَابَ الْحَرِيقِ
Allah hath heard the taunt of those who say: "Truly, Allah is indigent and we are rich!"- We shall certainly record their word and (their act) of slaying the prophets in defiance of right, and We shall say: "Taste ye the penalty of the Scorching Fire.
وَلَا تُؤْمِنُوا إِلَّا لِمَن تَبِعَ دِينَكُمْ قُلْ إِنَّ الْهُدَىٰ هُدَى اللَّهِ أَن يُؤْتَىٰ أَحَدٌ مِّثْلَ مَا أُوتِيتُمْ أَوْ يُحَاجُّوكُمْ عِندَ رَبِّكُمْ ۗ قُلْ إِنَّ الْفَضْلَ بِيَدِ اللَّهِ يُؤْتِيهِ مَن يَشَاءُ ۗ وَاللَّهُ وَاسِعٌ عَلِيمٌ
And believe no one unless he follows your religion." Say: "True guidance is the Guidance of Allah: (Fear ye) Lest a revelation be sent to someone (else) Like unto that which was sent unto you? or that those (Receiving such revelation) should engage you in argument before your Lord?" Say: "All bounties are in the hand of Allah: He granteth them to whom He pleaseth: And Allah careth for all, and He knoweth all things.