Charles Ellicott Commentary Psalms 103:3

"Who forgiveth all thine iniquities; Who healeth all thy diseases;" — Psalms 103:3 (ASV)

Forgives. —The first “benefit” to one who aims at the higher life is the knowledge of the Divine readiness to forgive and renew, and this, as Augustine remarks, implies a quick moral sense: “God’s benefits will not be before our eyes unless our sins are also before our eyes.”

Diseases. —Here chiefly in a moral sense, as the parallelism “iniquity” shows, even if the next verse, taken literally, implies an allusion to physical suffering as well.