They had seen others made partakers of Christ’s mercies, but forasmuch as no man has so strong a sense of those things that are done in the person of another as of what is done to himself, it behoved that in their own bodies they should feel Christ’s mercies. Therefore He willed that this tempest should arise, that in their deliverance they might have a more lively sense of His goodness. This tossing of the sea was a type of their future trials of which Paul speaks, “I would not have you ignorant, brethren, how that we were troubled beyond our strength.” [2 Cor 1:8]
But that there might be time for their fear to arise, it follows, “But he was asleep.” For if the storm had arisen while He was awake, they would either not have feared, or not have prayed Him, or would not have believed that He had the power to still it.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).