Thou art fairer than the children of men. It has been argued that a description of the Messiah would not lay stress on his personal beauty. But in the Song of Songs the personal beauty of the bridegroom, whom so many critics regard as the Messiah, is a main point (Song of Solomon 5:10-16).
A perfect man, such as Messiah was to be, must needs be beautiful, at any rate with a beauty of expression. In calling his bridegroom "fair beyond the sons of men," the writer at once gives us to understand that he is not a mere man.
Grace is poured into thy lips; rather, grace is poured out on thy lips (Hengstenberg, Cheyne, Kay). The gift of gracious expression and gracious speech has been poured upon him from on high (comp. Song of Solomon 5:16, "His mouth is most sweet").
Therefore God hath blessed thee for ever. The gifts bestowed upon him show the Divine favor and blessing, which, once granted, are not capriciously withdrawn.