But I will sing of thy power - That is, I will praise thee for the manifestation of thy power in rescuing me from danger.
Yea, I will sing aloud of thy mercy in the morning - When the light dawns; when these troubles are over; when the night of calamity shall have passed by. There is an allusion here, probably, to the fact that they encompassed the place of his abode at night Psalms 59:6, Psalms 59:14; but there is also the implied idea that that night was emblematic of sorrow and distress. The morning would come; morning after such a night of sorrow and trouble; a morning of joy and gladness, when he would feel that he had complete deliverance. Then would he praise God aloud. Compare the notes at Isaiah 21:12.
For thou hast been my defense and refuge in the day of my trouble - That is, he looked to the time when he would feel this; when looking back he could say this; when in view of it he would praise God.