For you have made him most blessed forever: you have made him exceedingly glad with your presence.
All Commentaries on Psalms 21:6 Go To Psalms 21
Augustine of Hippo
AD 430
7. "For Thou shalt give Him blessing for ever and ever." This is the blessing which Thou shalt give Him for ever and ever: "Thou shall make Him glad in joy together with Thy countenance" (ver. 6). According to His manhood, Thou shall make Him glad together with Thy countenance, which He lifted up to Thee.