We set ourselves limits, but we are all strong enough to aim higher, to achieve our goals. All we have to do is find such strength within ourselves. Know how to develop it.
Lust is to the other passions what the nervous fluid is to life it supports them all, lends strength to them all ambition, cruelty, avarice, revenge, are all founded on lust.
Uncontrolled, the hunger and thirst after God may become an obstacle, cutting off the soul from what it desires. If a man would travel far along the mystic road, he must learn to desire God intensely but in stillness, passively and yet with all his heart and mind and strength.