Here I must notice a matter of controversy between us and those who maintain that the manifestation of union is the denial of separation, because the two terms contradict each other, and that when anyone passes under the absolute sway of Divine guidance he ceases to act and to mortify himself. This is sheer nullification (_ta`ṭíl_), for a man must never cease to practise devotion and mortify himself as long as he has the possibility and power of doing so. Moreover, union is not apart from separation, as light is apart from the sun, and accident from substance, and attribute from object: therefore, neither is self-mortification apart from Divine guidance, nor the Truth from the Law, nor discovery from search. But mortification may precede or follow Divine guidance. In the former case a man’s tribulation is increased, because he is in “absence” (_ghaybat_), while in the latter case he has no trouble or pain, because he is in “presence” (_haḍrat_). Those to whom negation is the source (_mashrab_) of actions, and to whom it seems to be the substance (_`ayn_) of action, commit a grave error. A man, however, may attain such a degree that he regards all his qualities as faulty and defective, for when he sees that his praiseworthy qualities are vicious and imperfect, his blameworthy qualities will necessarily appear more vicious. I adduce these considerations because some ignorant persons, who have fallen into an error that is closely akin to infidelity, assert that no result whatever depends upon our exertion, and that inasmuch as our actions and devotions are faulty and our mortifications are imperfect a thing left undone is better than a thing done. To this argument I reply: “You are agreed in supposing that everything done by us has an energy (_fi`l_), and you declare that our energies are a centre of defect and a source of evil and corruption: consequently you must also suppose that things left undone by us have an energy; and since in both cases there is an energy involving defect, how can you regard that which we leave undone as better than that which we do?” This notion evidently is a noxious delusion. Here we have an excellent criterion to distinguish the believer from the infidel. Both agree that their energies are inherently defective, but the believer, in accordance with God’s command, deems a thing done to be better than a thing left undone, while the infidel, in accordance with his denial of the Creator (_t`aṭíl_), deems a thing left undone to be better than a thing done.