9 “I was looking for him that should save me from weakness of mind and tempest”. Sea there is, tempest there is: nothing for you remains but to cry out, “Lord, I perish.” Let Him stretch forth hand, who does the waves tread fearlessly, let Him relieve your dread, let Him confirm in Himself your security, let Him speak to you within, and say to you, “Give heed to Me, what I have borne:” an evil brother perchance you are suffering, or an enemy without art suffering; which of these have I not suffered?
There roared without Jews, within a disciple was betraying. There rages therefore tempest, but He does save men from weakness of mind, and tempest. Perchance your ship is being troubled, because He in you is sleeping. The sea was raging, the bark wherein the disciples were sailing was being tossed; but Christ was sleeping: at length it was seen by them that among them was sleeping the Ruler and Creator of winds; they drew near and awoke Christ; He commanded the winds, and there was a great calm.
With reason then perchance your heart is troubled, because you have forgotten Him on whom you have believed: beyond endurance you are suffering, because it has not come into your mind what for you Christ has borne. If unto your mind comes not Christ, He sleeps: awake Christ, recall faith. For then in you Christ is sleeping, if you have forgotten the sufferings of Christ: then in you Christ is watching, if you have remembered the sufferings of Christ. But when with full heart you shall have considered what He has suffered, will not you too with equanimity endure?
And perchance rejoicing, because you have been found in some likeness of the sufferings of your King. When therefore on these things thinking you have begun to be comforted and to rejoice, He has arisen, He has commanded the winds; therefore there is a great calm. “I was looking for Him that should save me from weakness of mind and tempest.”
Source: The Enarrations, or Expositions, on the Psalms (New Advent)