Most blessed. — Literally, blessings. The idiom is similar to that in Psalms 1:1.
With thy countenance. — Rather, In thy presence. (Comp. Psalms 16:11.)
Related Commentaries of Psalms 21:6
Psalms 21:6
6 For thou hast made him most blessed for ever: thou hast made him exceeding glad with thy countenance.