MOST of the classical commentators agree in that this surah was revealed towards the end of the Mecca period; some authorities (quoted by Suyuti) are even of the opinion that it is the very last Meccan revelation, but we have no conclusive evidence to that effect. From the first to the last verse, the discourse centres - as the title of the surah indicates - on the problem of true faith, the overwhelming evidence which points to the existence of an almighty Creator, and on man's ultimate responsibility before Him. Stress is laid on the fact of unceasing divine guidance manifested in a long succession of God-inspired prophets; and since all of them propounded one and the same truth, all who believe in God are reminded-as in 21:92-93 - that "this community of yours is one single community" (verse 52), and that this unity has been torn asunder by man's egotism, greed and striving after power (verses 53 if.). But the main theme of the surah is the reminder, expressed in a variety of arguments, that it is logically impossible to believe in God as a conscious Creative Power without believing in the reality of a life after death as well.