The training of this [mental] ego requires more care than the training of the other [physical] ego, for it is more difficult and a subtler matter to be aware of the desires of the mind and to weigh them than to be aware of and to weigh the desires of the body. No doubt vanity is natural to the ego and the ego is natural to every human being. But there are desires of the mind that are necessary and there are desires of the mind that are not necessary. And the more one controls the ego the more one allows the virtues and merits that are in one's heart to manifest. This ego gives a false idea of greatness, but the effacement of this ego results in the true greatness.