Meaningful relationships in Kahaf Surah

Recognition of meaning relationship between name of a Surah and its topics, between the beginning of Surah and its ending and between different parts of a Surah and its purpose has valuable uses in knowing wisdom and hidden secrets in the verses of Quran.
Quran states about the young people of Kahaf Surah
نَّحْنُ نَقُصُّ عَلَيْكَ نَبَأَهُم بِالْحَقِّ ۚ إِنَّهُمْ فِتْيَةٌ آمَنُوا بِرَبِّهِمْ وَزِدْنَاهُمْ هُدًى
We relate to thee their story in truth: they were youths who believed in their Lord, and We advanced them in guidance.
وَرَبَطْنَا عَلَىٰ قُلُوبِهِمْ إِذْ قَامُوا فَقَالُوا رَبُّنَا رَبُّ السَّمَاوَاتِ وَالْأَرْضِ لَن نَّدْعُوَ مِن دُونِهِ إِلَٰهًا ۖ لَّقَدْ قُلْنَا إِذًا شَطَطًا
We gave strength to their hearts: Behold, they stood up and said: "Our Lord is the Lord of the heavens and of the earth: never shall we call upon any god other than Him: if we did, we should indeed have uttered an enormity''.
The verses of the Surah embody persons that have resorted to right values, have divine norms in order to evaluate affairs, right logic and convincing reasons and have ability in subsuming external means. Moreover, the verses of Surah demonstrate attention of God them and means of existence for guarding them.
The beginning of Kahaf Surah is about glorification of God.
الْحَمْدُ لِلَّهِ الَّذِي أَنزَلَ عَلَىٰ عَبْدِهِ الْكِتَابَ وَلَمْ يَجْعَل لَّهُ عِوَجًا ۜ
Praise be to Allah, Who hath sent to His Servant the Book, and hath allowed therein no Crookedness.
The ending of the Surah expresses that pure and exalted God is qualified to be praised and worshipped;
قُل لَّوْ كَانَ الْبَحْرُ مِدَادًا لِّكَلِمَاتِ رَبِّي لَنَفِدَ الْبَحْرُ قَبْلَ أَن تَنفَدَ كَلِمَاتُ رَبِّي وَلَوْ جِئْنَا بِمِثْلِهِ مَدَدًا
Say: "If the ocean were ink (wherewith to write out) the words of my Lord, sooner would the ocean be exhausted than would the words of my Lord, even if we added another ocean like it, for its aid''.
قُلْ إِنَّمَا أَنَا بَشَرٌ مِّثْلُكُمْ يُوحَىٰ إِلَيَّ أَنَّمَا إِلَٰهُكُمْ إِلَٰهٌ وَاحِدٌ ۖ فَمَن كَانَ يَرْجُو لِقَاءَ رَبِّهِ فَلْيَعْمَلْ عَمَلًا صَالِحًا وَلَا يُشْرِكْ بِعِبَادَةِ رَبِّهِ أَحَدًا
Say: "I am but a man like yourselves, (but) the inspiration has come to me, that your Allah is one Allah: whoever expects to meet his Lord, let him work righteousness, and, in the worship of his Lord, admit no one as partner''.
Prophet (peace of Allah be upon him and his descendants) has two duties: giving hope to devout and righteous persons that are faithful to divine guidelines in the lifestyle and warning to persons that have considered remarks of the prophet false;
قَيِّمًا لِّيُنذِرَ بَأْسًا شَدِيدًا مِّن لَّدُنْهُ وَيُبَشِّرَ الْمُؤْمِنِينَ الَّذِينَ يَعْمَلُونَ الصَّالِحَاتِ أَنَّ ل)َهُمْ أَجْرًا حَسَنًا
(He hath made it) Straight (and Clear) in order that He may warn (the godless) of a terrible Punishment from Him, and that He may give Glad Tidings to the Believers who work righteous deeds, that they shall have a goodly Reward.
مَّاكِثِينَ فِيهِ أَبَدًا
Wherein they shall remain for ever.
وَيُنذِرَ الَّذِينَ قَالُوا اتَّخَذَ اللَّهُ وَلَدًا
Further, that He may warn those (also) who say, "Allah hath begotten a son''.
Moreover, this duty of the prophet has been expressed at the end of Surah;
إِنَّ الَّذِينَ آمَنُوا وَعَمِلُوا الصَّالِحَاتِ كَانَتْ لَهُمْ جَنَّاتُ الْفِرْدَوْسِ نُزُلًا
As to those who believe and work righteous deeds, they have, for their entertainment, the Gardens of Paradise.
خَالِدِينَ فِيهَا لَا يَبْغُونَ عَنْهَا حِوَلًا
Wherein they shall dwell (for aye): no change will they wish for from them.
Warning of God has been expressed in the following verses;
أَفَحَسِبَ الَّذِينَ كَفَرُوا أَن يَتَّخِذُوا عِبَادِي مِن دُونِي أَوْلِيَاءَ ۚ إِنَّا أَعْتَدْنَا جَهَنَّمَ لِلْكَافِرِينَ نُزُلًا
Do the Unbelievers think that they can take My servants as protectors besides Me? Verily We have prepared Hell for the Unbelievers for (their) entertainment.
ذَٰلِكَ جَزَاؤُهُمْ جَهَنَّمُ بِمَا كَفَرُوا وَاتَّخَذُوا آيَاتِي وَرُسُلِي هُزُوًا
That is their reward, Hell, because they rejected Faith, and took My Signs and My Messengers by way of jest.
The beginning of Surah refers to right way of understanding;
الْحَمْدُ لِلَّهِ الَّذِي أَنزَلَ عَلَىٰ عَبْدِهِ الْكِتَابَ وَلَمْ يَجْعَل لَّهُ عِوَجًا ۜ
Praise be to Allah, Who hath sent to His Servant the Book, and hath allowed therein no Crookedness.
قَيِّمًا لِّيُنذِرَ بَأْسًا شَدِيدًا مِّن لَّدُنْهُ وَيُبَشِّرَ الْمُؤْمِنِينَ الَّذِينَ يَعْمَلُونَ الصَّالِحَاتِ أَنَّ لَهُمْ أَجْرًا حَسَنًا
(He hath made it) Straight (and Clear) in order that He may warn (the godless) of a terrible Punishment from Him, and that He may give Glad Tidings to the Believers who work righteous deeds, that they shall have a goodly Reward.
At the end of the Surah, these two ways have been expressed;
الَّذِينَ كَانَتْ أَعْيُنُهُمْ فِي غِطَاءٍ عَن ذِكْرِي وَكَانُوا لَا يَسْتَطِيعُونَ سَمْعًا
(Unbelievers) whose eyes had been under a veil from remembrance of Me, and who had been unable even to hear.
أَفَحَسِبَ الَّذِينَ كَفَرُوا أَن يَتَّخِذُوا عِبَادِي مِن دُونِي أَوْلِيَاءَ ۚ إِنَّا أَعْتَدْنَا جَهَنَّمَ لِلْكَافِرِينَ نُزُلًا
Do the Unbelievers think that they can take My servants as protectors besides Me? Verily We have prepared Hell for the Unbelievers for (their) entertainment.
قُلْ هَلْ نُنَبِّئُكُم بِالْأَخْسَرِينَ أَعْمَالًا
Say: "Shall we tell you of those who lose most in respect of their deeds''?
الَّذِينَ ضَلَّ سَعْيُهُمْ فِي الْحَيَاةِ الدُّنْيَا وَهُمْ يَحْسَبُونَ أَنَّهُمْ يُحْسِنُونَ صُنْعًا
Those whose efforts have been wasted in this life, while they thought that they were acquiring good by their works?
The right value of the world and its events are basic and permanent principles in Islamic beliefs as Qurans states at the beginning and ending of Kahaf Surah;
إِنَّا جَعَلْنَا مَا عَلَى الْأَرْضِ زِينَةً لَّهَا لِنَبْلُوَهُمْ أَيُّهُمْ أَحْسَنُ عَمَلًا
That which is on earth we have made but as a glittering show for the earth, in order that We may test them - as to which of them are best in conduct.
وَإِنَّا لَجَاعِلُونَ مَا عَلَيْهَا صَعِيدًا جُرُزًا
Verily what is on earth we shall make but as dust and dry soil (without growth or herbage).
أُولَٰئِكَ الَّذِينَ كَفَرُوا بِآيَاتِ رَبِّهِمْ وَلِقَائِهِ فَحَبِطَتْ أَعْمَالُهُمْ فَلَا نُقِيمُ لَهُمْ يَوْمَ الْقِيَامَةِ وَزْنًا
They are those who deny the Signs of their Lord and the fact of their having to meet Him (in the Hereafter): vain will be their works, nor shall We, on the Day of Judgment, give them any weight.
وَمَا هَٰذِهِ الْحَيَاةُ الدُّنْيَا إِلَّا لَهْوٌ وَلَعِبٌ ۚ وَإِنَّ الدَّارَ الْآخِرَةَ لَهِيَ الْحَيَوَانُ ۚ لَوْ كَانُوا يَعْلَمُونَ
What is the life of this world but amusement and play? but verily the Home in the Hereafter,- that is life indeed, if they but knew.
Quran states at the beginning of Kahaf Surah
أَحَسِبَ النَّاسُ أَن يُتْرَكُوا أَن يَقُولُوا آمَنَّا وَهُمْ لَا يُفْتَنُونَ
Do men think that they will be left alone on saying, "We believe", and that they will not be tested''.
وَلَقَدْ فَتَنَّا الَّذِينَ مِن قَبْلِهِمْ ۖ فَلَيَعْلَمَنَّ اللَّهُ الَّذِينَ صَدَقُوا وَلَيَعْلَمَنَّ الْكَاذِبِينَ
We did test those before them, and Allah will certainly know those who are true from those who are false.
أَمْ حَسِبَ الَّذِينَ يَعْمَلُونَ السَّيِّئَاتِ أَن يَسْبِقُونَا ۚ سَاءَ مَا يَحْكُمُونَ
Do those who practise evil think that they will get the better of Us? Evil is their judgment.
مَن كَانَ يَرْجُو لِقَاءَ اللَّهِ فَإِنَّ أَجَلَ اللَّهِ لَآتٍ ۚ وَهُوَ السَّمِيعُ الْعَلِيمُ
For those whose hopes are in the meeting with Allah (in the Hereafter, let them strive); for the term (appointed) by Allah is surely coming and He hears and knows (all things ).
وَمَن جَاهَدَ فَإِنَّمَا يُجَاهِدُ لِنَفْسِهِ ۚ إِنَّ اللَّهَ لَغَنِيٌّ عَنِ الْعَالَمِينَ
And if any strive (with might and main), they do so for their own souls: for Allah is free of all needs from all creation.
وَالَّذِينَ آمَنُوا وَعَمِلُوا الصَّالِحَاتِ لَنُكَفِّرَنَّ عَنْهُمْ سَيِّئَاتِهِمْ وَلَنَجْزِيَنَّهُمْ أَحْسَنَ الَّذِي كَانُوا يَعْمَلُونَ
Those who believe and work righteous deeds,- from them shall We blot out all evil (that may be) in them, and We shall reward them according to the best of their deeds.
وَوَصَّيْنَا الْإِنسَانَ بِوَالِدَيْهِ حُسْنًا ۖ وَإِن جَاهَدَاكَ لِتُشْرِكَ بِي مَا لَيْسَ لَكَ بِهِ عِلْمٌ فَلَا تُطِعْهُمَا ۚ إِلَيَّ مَرْجِعُكُمْ فَأُنَبِّئُكُم بِمَا كُنتُمْ تَعْمَلُونَ
We have enjoined on man kindness to parents: but if they (either of them) strive (to force) thee to join with Me (in worship) anything of which thou hast no knowledge, obey them not. Ye have (all) to return to me, and I will tell you (the truth) of all that ye did.
The first feature of Quran is its rightness and the its second feature has been expressed in the following verse;
وَأَنزَلْنَا إِلَيْكَ الْكِتَابَ بِالْحَقِّ مُصَدِّقًا لِّمَا بَيْنَ يَدَيْهِ مِنَ الْكِتَابِ وَمُهَيْمِنًا عَلَيْهِ ۖ فَاحْكُم بَيْنَهُم بِمَا أَنزَلَ اللَّهُ ۖ وَلَا تَتَّبِعْ أَهْوَاءَهُمْ عَمَّا جَاءَكَ مِنَ الْحَقِّ ۚ لِكُلٍّ جَعَلْنَا مِنكُمْ شِرْعَةً وَمِنْهَاجًا ۚ وَلَوْ شَاءَ اللَّهُ لَجَعَلَكُمْ أُمَّةً وَاحِدَةً وَلَٰكِن لِّيَبْلُوَكُمْ فِي مَا آتَاكُمْ ۖ فَاسْتَبِقُوا الْخَيْرَاتِ ۚ إِلَى اللَّهِ مَرْجِعُكُمْ جَمِيعًا فَيُنَبِّئُكُم بِمَا كُنتُمْ فِيهِ تَخْتَلِفُون
To thee We sent the Scripture in truth, confirming the scripture that came before it, and guarding it in safety: so judge between them by what Allah hath revealed, and follow not their vain desires, diverging from the Truth that hath come to thee. To each among you have we prescribed a law and an open way. If Allah had so willed, He would have made you a single people, but (His plan is) to test you in what He hath given you: so strive as in a race in all virtues. The goal of you all is to Allah; it is He that will show you the truth of the matters in which ye dispute.
Quran observes life and Islamic society. Rightness and superiority of this book is that Islamic nation is better than other nations. Quran states
يَا أَيُّهَا الَّذِينَ آمَنُوا كُونُوا قَوَّامِينَ لِلَّهِ شُهَدَاءَ بِالْقِسْطِ ۖ وَلَا يَجْرِمَنَّكُمْ شَنَآنُ قَوْمٍ عَلَىٰ أَلَّا تَعْدِلُوا ۚ اعْدِلُوا هُوَ أَقْرَبُ لِلتَّقْوَىٰ ۖ وَاتَّقُوا اللَّهَ ۚ إِنَّ اللَّهَ خَبِيرٌ بِمَا تَعْمَلُونَ
O ye who believe! stand out firmly for Allah, as witnesses to fair dealing, and let not the hatred of others to you make you swerve to wrong and depart from justice. Be just: that is next to piety: and fear Allah. For Allah is well-acquainted with all that ye do.
وَكَذَٰلِكَ جَعَلْنَاكُمْ أُمَّةً وَسَطًا لِّتَكُونُوا شُهَدَاءَ عَلَى النَّاسِ وَيَكُونَ الرَّسُولُ عَلَيْكُمْ شَهِيدًا ۗ وَمَا جَعَلْنَا الْقِبْلَةَ الَّتِي كُنتَ عَلَيْهَا إِلَّا لِنَعْلَمَ مَن يَتَّبِعُ الرَّسُولَ مِمَّن يَنقَلِبُ عَلَىٰ عَقِبَيْهِ ۚ وَإِن كَانَتْ لَكَبِيرَةً إِلَّا عَلَى الَّذِينَ هَدَى اللَّهُ ۗ وَمَا كَانَ اللَّهُ لِيُضِيعَ إِيمَانَكُمْ ۚ إِنَّ اللَّهَ بِالنَّاسِ لَرَءُوفٌ رَّحِيمٌ
Thus, have We made of you an Ummat justly balanced, that ye might be witnesses over the nations, and the Messenger a witness over yourselves; and We appointed the Qibla to which thou wast used, only to test those who followed the Messenger from those who would turn on their heels (From the Faith). Indeed it was (A change) momentous, except to those guided by Allah. And never would Allah Make your faith of no effect. For Allah is to all people Most surely full of kindness, Most Merciful.
كُنتُمْ خَيْرَ أُمَّةٍ أُخْرِجَتْ لِلنَّاسِ تَأْمُرُونَ بِالْمَعْرُوفِ وَتَنْهَوْنَ عَنِ الْمُنكَرِ وَتُؤْمِنُونَ بِاللَّهِ ۗ وَلَوْ آمَنَ أَهْلُ الْكِتَابِ لَكَانَ خَيْرًا لَّهُم ۚ مِّنْهُمُ الْمُؤْمِنُونَ وَأَكْثَرُهُمُ الْفَاسِقُونَ
Ye are the best of peoples, evolved for mankind, enjoining what is right, forbidding what is wrong, and believing in Allah. If only the People of the Book had faith, it were best for them: among them are some who have faith, but most of them are perverted transgressors.
ذَٰلِكَ الْكِتَابُ لَا رَيْبَ ۛ فِيهِ ۛ هُدًى لِّلْمُتَّقِينَ
. This is the Book; in it is guidance sure, without doubt, to those who fear Allah
Quran states that persons have not been created in useless way;
أَفَحَسِبْتُمْ أَنَّمَا خَلَقْنَاكُمْ عَبَثًا وَأَنَّكُمْ إِلَيْنَا لَا تُرْجَعُونَ
Did ye then think that We had created you in jest, and that ye would not be brought back to Us (for account).
Emphasis in permanence of the heaven is reminded;
وَالَّذِينَ هُمْ عَنِ اللَّغْوِ مُعْرِضُونَ
Who avoid vain talk.