Wa-itha ghashiyahum mawjun kaththulali daAAawoo Allaha mukhliseena lahu addeena falamma najjahum ila (surah Luqman: 32)

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(31:32) When waves engulf them (in the sea) like canopies, they call upon Allah, consecrating their faith solely to Him. But when He delivers them safely to the land, some of them become lukewarm. *57 None denies Our Signs except the perfidious, the ungrateful. *58

Wa izaa ghashiyahum mawjun kazzulali da`a-wul laaha mukhliseena lahud deena fa lammaa najjaahum ilal barri faminhum muqtasid; wa maa yajhadu bi Aayaatinaa illaa kullu khattaarin kafoor

*57) "Iqtisad" in the original may mean uprightness or moderateness. In the first case, the verse would mean: "A few of them only remain steadfast on Tauhid, which they had promised to follow when overwhelmed by the stone, and this makes them adhere to uprightness ever afterwards." If it is taken to mean moderateness, it would mean: Some of them become moderate and less rigid in their creed of atheism and polytheism, or they lose some of their fervour and enthusiasm that had been caused by the incident of calamity." Most probably AIlah has used this0 meaningful sentence here in order to allude to aII the three states simultaneously. The object probably is to point out the fact that during the storm at sea the mind of everybody is automatically set right, and everybody gives up atheism and polytheism and starts invoking One AIIah for help. But as soon as they safely land on the shore, only a few of them seem to have learnt any enduring lesson from their experience. Then, this small number also is divided into three groups: those who adopt uprightness ever afterwards, and those who become moderate in their disbelief, and Those who retain some of the spirit of enthusiasm caused temporarily by the calamity.
*58) These two qualities are the antithesis of the two qualities mentioned in the preceding verse. A treacherous person is he who is utterly disloyal and who has no regard for his promise and pledge, and the ungrateful he who does not acknowledge the good and the gains and the benefits received by him, and even behaves rebelliously towards his benefactor. The people having these qualities return to their disbelief, their atheism and their polytheism without any hesitation as soon as the danger has been averted. They do not admit that they had perceived some signs in their own selves as well as outside themselves of Allah's existence and of His being only One when overwhelmed by the stone, and their invoking aIlah was in fact the result of their recognition of the same reality. The atheists among them explain away their act, saying, "It was a weakness which we manifested in the state of confusion and bewilderment, whereas there exists no God, Who might have saved us from the storm: we in fact succeeded in escaping by virtue of such and such a device and means and resources. " As for the mushriks, they generally say, "We had the succour and protection of such and such a saint or god and goddess available to us by virtue of which we escaped. " Therefore, as soon as they land on the shore, they start giving thanks to these false gods and presenting offerings at their shrines. They do not bother to think that when they had lost hope, there was none beside Allah, the One, whom they might have implored and invoked for help.