Ps. 90 has been described as a melody of God’s power and purpose, with undertones decrying the frailty and transitoriness of man. It is probably the most magnificent poem ever written on the vanity of human life, in the light of the poet’s vivid faith in the promises of God. Isaac Taylor called Ps. 90 “the most sublime of human compositions, the deepest in feeling, the loftiest in theological conceptions, the most magnificent in its imagery.” Nations and men may change, grow old, and perish; God remains unchangeable, eternal in His majesty. “Satisfaction, gladness, success in work must all come from the right relation of man in his frailty to the eternal Lord” (G. Campbell Morgan).
Ruggedness of style, “the stamp of high antiquity,” vastness of theme, frequent identity with the language of Deuteronomy—these elements help to support the view that Moses was the author of Ps. 90.