When there is tranquillity, all his miseries are destroyed, for the mind of him whose heart is tranquil soon becomes steady. He who is not self-restrained has no steadiness of mind; nor has he who is not self-restrained perseverance in the pursuit of self-knowledge; there is no tranquillity for him who does not persevere in the pursuit of self-knowledge; and whence can there be happiness for one who is not tranquil?