Thy righteousness also, O God, is very high - See the notes at Psalms 36:5. The purpose of the psalmist is to exalt that righteousness as much as possible, and he, therefore, compares it with that which is high - the heavens - the highest thing of all. The literal rendering would be, “even to the high,” or the height; that is, to the highest place. The passage is designed to express his confidence in God, in the infirmities and troubles which he must expect to come upon him with advancing years.
Who hast done great things - In his work of creation; in his providence; in his manifested mercy toward his people. He had done things so great as to show that he could protect those who put their trust in him.
O God, who is like unto thee! - Who can be compared to thee! See the notes at Psalms 35:10. Compare the notes at Isaiah 40:18. See also Psalms 89:8; Exodus 15:11; 2 Samuel 7:22.