With long life will I satisfy him, and shew him my salvation.
With long life will I satisfy him - literally, 'with length of days.' The promise belongs to Christ and Christ's people in its ulterior sense. Psalms 21:4. "He (the anointed King) asked life of thee (not only for Himself, as man, but for His people also), and thou gavest it Him, even length of days forever and ever" (John 5:26; John 10:28). The earthly long life granted to many, as Abraham, Job, David, who "died in good old age, and full of years" (Genesis 25:8), is a type of the future eternal life of body and soul united (Job 42:17; 1 Chronicles 23:1; cf. Proverbs 3:2). The temporal Old Testament blessing of a full age typifies the spiritual and heavenly New Testament blessing (Exodus 20:12; Deuteronomy 5:16).
And show him my salvation - (Psalms 50:23)