For if He did not give the water the strength to carry the ships, they would not sail. So he says:

[لِيُرِيَكُمْ مِّنْ ءَايَـتِهِ]

(that He may show you of His signs) meaning, by His power.

[إِنَّ فِى ذلِكَ لآيَـتٍ لِّكُلِّ صَبَّارٍ شَكُورٍ]

(Verily, in this are signs for every patient, grateful.) means, every person who bears difficulty with patience and who gives thanks at times of ease. Then Allah says:

[وَإِذَا غَشِيَهُمْ مَّوْجٌ كَالظُّلَلِ]

(And when waves cover them like shades,) meaning, like mountains or clouds,

[دَعَوُاْ اللَّهَ مُخْلِصِينَ لَهُ الدِّينَ]

(they invoke Allah, making their invocations for Him only.) This is like the Ayah,

[وَإِذَا مَسَّكُمُ الْضُّرُّ فِى الْبَحْرِ ضَلَّ مَن تَدْعُونَ إِلاَ إِيَّاهُ]

(And when harm touches you upon the sea, those that you call upon vanish from you except Him) (17:67).

[فَإِذَا رَكِبُواْ فِى الْفُلْكِ]

(And when they embark on a ship...) (29:65) Then Allah says:

[فَلَمَّا نَجَّـهُمْ إِلَى الْبَرِّ فَمِنْهُمْ مُّقْتَصِدٌ]

(But when He brings them safe to land, there are among them those that stop in between.) Mujahid said, "This refers to the disbelievers -- as if he interpreted the word Muqtasid to mean denier as in the Ayah,

[فَلَمَّا نَجَّاهُمْ إِلَى الْبَرِّ إِذَا هُمْ يُشْرِكُونَ]

(but when He brings them safely to land, behold, they give a share of their worship to others) (29:65).

[وَمَا يَجْحَدُ بِـَايَـتِنَآ إِلاَّ كُلُّ خَتَّارٍ كَفُورٍ]

(And Our Ayat are not denied except by every Khattar Kafur.) Khattar means one who betrays or stabs in the back. This was the view of Mujahid, Al-Hasan, Qatadah and Malik, narrating from Zayd bin Aslam. This word describes a person who, whenever he makes a promise, breaks his promise, and it refers to the worst form of treachery.

[كَفُورٌ]

(Kafur) means, one who denies blessings and does not give thanks for them, rather he forgets them and does not remember them.

[يأَيُّهَا النَّاسُ اتَّقُواْ رَبَّكُمْ وَاخْشَوْاْ يَوْماً لاَّ يَجْزِى وَالِدٌ عَن وَلَدِهِ وَلاَ مَوْلُودٌ هُوَ جَازٍ عَن وَالِدِهِ شَيْئاً إِنَّ وَعْدَ اللَّهِ حَقٌّ فَلاَ تَغُرَّنَّكُمُ الْحَيَوةُ الدُّنْيَا وَلاَ يَغُرَّنَّكُم بِاللَّهِ الْغَرُورُ ]

(33. O mankind! Have Taqwa of your Lord, and fear a Day when no father can avail aught for his son, nor a son avail aught for his father. Verily, the promise of Allah is true, let not then this present life deceive you, nor let the chief deceiver deceive you about Allah.)