Will strengthen. — Literally, will prop him up, support him.
Wilt make. — Literally, hast turned. Some think with literal allusion to the fact that the Oriental bed was merely a mat, which could be turned while the sick man was propped up. But such literalness is not necessary. To turn here is to change, as in Psalms 66:6; Psalms 105:29, and what the poet says is that, as in past times, Divine help has come to change his sickness into health, so he confidently expects it will be now, “in his sickness” being equivalent to “in the time of his sickness.”