Surah 10. Yunus, Ayah 21

Lit., "they have forthwith a scheme against Our messages". (The particle idha preceding this clause is meant to bring out the element of immediacy, and is best rendered as "lo! they forthwith...", etc.) Since God's messages are purely conceptual, the "scheming against them" obviously connotes the devising of fallacious arguments meant to cast doubt on the divine origin of these messages or to "disprove" the statements made in them. The above discourse on the psychology of agnosticism and half-belief is continued in the parable of the seafarers set forth in the next two verses.

I.e., the two categories of people referred to in verses {7}, {11}, {12}, {15}, {18} and {20}.

Man turns his thoughts in adversity to Allah. But as soon as the trouble is past, he not only forgets Him but actually strives against His cause. But such people are poor ignorant creatures, not realising that the Universal Plan of Allah is swifter to stop their petty plans, and that though they fail, the record of them remains eternally against them.