As faith leads to full knowledge, so hope leads to perfect love, and, as it is said, If you will not believe you shall not understand (Is. vii. 9, acc. to lxx.), so it may equally be said with fitness, if you have not hoped, you will not perfectly love. Knowledge then is the fruit of faith, perfect charity of hope. In the meantime the just lives by faith (Hab. ii. 4), but he is not happy except by knowledge; and he aspires towards God as the hart desires the water-brooks; but the blessed drinks with joy from the fountain of the Saviour, that is, he delights in the fulness of love.
Thus understanding and love, that is, the knowledge of and delight in the truth, are, perhaps, as it were, the two arms of the soul, with which it embraces and comprehends with all saints the length and breadth, the height and depth, that is the eternity, the love, the goodness, and the wisdom of God. And what are all these but Christ?
Bernard of Clairvaux, Letter VI to Peter, Cardinal Deacon (slightly modernized)