It is a very necessary thing in the life of an adept for him to adapt his mind and body to the spiritual life, in other words, it is necessary for a man to become his natural self before he begins his journey in a spiritual path. It is this naturalness which is called by the orthodox purity. For pure water, or pure milk, means water or milk in its own essence; when another element is mixed with it then its purity is lost. To become spiritual means to purify one's spirit from the foreign elements which take away the natural feeling of the spirit.