I have said that God is pleased with nothing but love; but before I explain this, it will be as well to set forth the grounds on which the assertion rests. All our works, and all our labours, how grand soever they may be, are nothing in the sight of God, for we can give Him nothing, neither can we by them fulfil His desire, which is the growth of our soul. As to Himself He desires nothing of this, for He has need of nothing, and so, if He is pleased with anything it is with the growth of the soul; and as there is no way in which the soul can grow but in becoming in a manner equal to Him, for this reason only is He pleased with our love.
John of the Cross