The apostles expected Jesus to reappear in their life time as did Paul.
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It is vital that it seem imminent ... any moment any day in order for people/believers to live according to the Scriptures. Otherwise they would and could do anything, and suppose they can repent before they die. Which by the way happens to many everyday, that did not expect it; and perhaps were unable to have time to repent.
Sincerity is a necessity (of belief/faith)for saving grace, not just words.