[1]
This sentence again contains a subtle point of the wisdom of preaching. Saying this the man made the people realize: The Lord in Whom I have believed is not merely my Lord but your Lord, too. I have committed no error by believing in Him, but you, in fact, are certainly committing an error by not believing in Him.
[2]
Frequently the Qur’an addresses the events of the hereafter in pasttense; this grammatical shift should be pondered by the reader.