In Islam there is no caste, as the Message was meant to be for uniting humanity in one brotherhood, and yet it was found necessary to train the individuals according to their evolution in life. A training was given in four classes, namely, Shariat, Tarikat, Haqiqat, and Marifat.

Since the world of Islam became busy in national and social affairs, the Shariat was held fast by the religious authorities and Tarikat only with a few pious ones, who sought the door of a Sufi, wanting an initiation in the inner light which was contained in the two remaining classes, Haqiqat and Marifat.

The two immediate disciples of the Prophet, Ali and Sadik, were initiated by the Prophet, and were the great Masters of the inner teachings of the knowledge of God. Besides, the Sufis who existing during the time of the Prophet were benefited by the presence of the Prophet and the inspiration they gained in Sufism, to which one soon reaches through the path of Shariat, Tariqat, Haqiqat, and Marifat.

Shariat means the law that it is necessary for the collectivity to observe, to harmonize with one's surroundings and with one's self within. Although the religious authorities of Islam have limited it to restrictions, yet a thousand places in the Qur'an and Hadith one can trace where the law of Shariat is meant to be subject to change to suit the time and place. The law of Shariat, unlike any other religious law, deals with all aspects of life, and it is therefore that the Prophet of Islam had to experience personally all aspects of life. The Prophet as an orphan, as a warrior, as a politician, as a merchant, as a shepherd, as a king, as a husband, as a father, as brother, as son and grandson, had to play different parts in the world's various aspects of life before he was prepared to give this divine law.

Tariqat is the understanding of law besides following it, that we must understand the cause of all things that we must do and must not do, instead of obeying the law without understanding. Those who are not evolved are supposed to have faith and to submit to the law. It is for those whose intelligence does not accept things that cannot answer their reason.

Haqiqat is to know the truth of our being and the inner law of Nature. This knowledge widens the heart of a person. When he has realized the truth of being, he has realized the One Being; he is different from nobody, distant from no one: he is one with all. That is the grade where religion ends and Sufism begins.

Marifat is the actual realization of God, the One Being, when there is no doubt anywhere.

When these four classes are accomplished, then the full play of Sufism comes. Sufi means Safi, pure--not only pure from differences and distinctions, but even pure from all that is learnt and known. That is the state of Allah, the pure and perfect One.