By the constant study of life the Sufi realizes that mankind, which claims to be the most just in all creation, is found in the end to be the most unjust. Man is generally just when he judges another, but he is unjust when the thing concerns himself, though he is not conscious of it. He calls it justice too. Therefore the lesson that the Sufi learns in the law of reciprocity is to consider it a natural thing when injustice is shown by others; but he tries in every dealing with others to be as just as he can. He tolerates the injustice of others as much as his state of evolution permits; but when he sees that more than this is intolerable, he resists it with explanations, with persuasion, even with threatening. But the tolerance with which he overlooks the injustice of others is for others only; when it comes to his dealings with others, he does not tolerate even the slightest injustice on his own part. The sense of justice is not the same in everybody; it is according to a person's evolution and his ideal.