Matthew Poole and continuators on Acts 27:22

22 And now I exhort you to be of good cheer: for there shall be no loss of any mans life among you, but of the ship.

Provided they would do as he required of them: See ver. 31. In God's Promises there is a tacit condition, which from the Nature of the thing is to be understood; as in that which was made to Eli, mentioned 1 Sam. 2.30. Paul did foretel this so particularly, that when it was come to pass, he might gain the more reputation to the truth of the Gospel which he preached, and more glory to that God whom he worshipped.