O thou son of the Kingdom! All things are beneficial if
joined with the love of God; and without His love all things
are harmful, and act as a veil between man and the Lord of
the Kingdom. When His love is there, every bitterness
turneth sweet, and every bounty rendereth a wholesome
pleasure. For example, a melody, sweet to the ear, bringeth
the very spirit of life to a heart in love with God, yet
staineth with lust a soul engrossed in sensual desires. And
every branch of learning, conjoined with the love of
God, is approved and worthy of praise; but bereft of His
love, learning is barren—indeed, it bringeth on madness.
Every kind of knowledge, every science, is as a tree: if the
fruit of it be the love of God, then is it a blessed tree, but if
not, that tree is but dried-up wood, and shall only feed the
fire.