Adam Clarke on Psalms 63:3

Thy loving-kindness is better than life - This is the language of every regenerate soul. But O how few prefer the approbation of God to the blessings of life, or even to life itself in any circumstances! But the psalmist says, Thy loving-kindness, חסדך chasdecha, thy effusive mercy, is better מחיים mechaiyim, than Lives: it is better than, or good beyond, countless ages of human existence.

My lips shall praise thee - Men praise, or speak well, of power, glory, honor, riches, worldly prospects and pleasures; but the truly religious speak well of God, in whom they find infinitely more satisfaction and happiness than worldly men can find in the possession of all earthly good.