Chrysostom: "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.
Chrysostom: "They had witnessed others partake in Christ's benevolences, but since no one has a more profound sense of another's experiences than their own, it was necessary that they personally feel Christ's mercies. Therefore, He decreed that this turmoil should occur, so that in their liberation, they might have a more intense awareness of His goodness. This turbulent sea served as a type of the trials they would face in the future, which Paul warns against, saying we were troubled beyond our capacity.