Say: "He is (Allah) Most Gracious: We have believed in Him, and on Him have we put our trust: So, soon will ye know which (of us) it is that is in manifest error." (29)
Tafsir
When the addressee is not convinced by reasoning, the preacher repeats his utterances of firm faith and thus stirs his inner self into awakening. Even if there is the slightest sensitivity in a man, these last utterances are enough to make him feel the urge to reform himself. But one whose conscience has been completely blunted, can never be awakened by any device.
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