I remember the days of old - Former times.
(1) as contrasted with my present condition.
(2) as times when I called upon thee, and thou didst interpose.
(3) as encouraging me now to come to thee, and spread out my case before thee. See Psalms 77:5-11, note; Psalms 42:4, note.
I meditate on all thy works ... - On what thou hast done; on thy gracious interpositions in the time of trial; on the manifestations of thy power in my behalf, and in behalf of thy people. I call all this to mind, remembering that thou art an unchangeable God; that thou hast the same power still; that thou canst interpose now as thou didst then; and that, as an unchangeable God, thou wilt do it in the same circumstances. I, therefore, come to thee, and pray that thou wilt interpose in my behalf.