John Calvin on Acts 27:38-40

38. And when they had eaten enough. This circumstance doth show that they were at length moved with Paul’s words. It was not yet light, that they could know whether there were any haven near. And yet they cast out into the sea the wheat which remained, that they might lighten the ship. They would not have done this unless Paul’s authority had prevailed more with them now than before. But as all unbelievers are unstable, that persuasion did quickly vanish out of their minds.