"Every passion, every emotion has its effect upon the mind, and every change of mind, however slight, has its effect upon man's body." 

Hazrat Inayat Khan

Commentary by Pir-o-Murshid Inayat Khan:

Different conditions and the changes that take place in the world have their effect upon the mind, and the different conditions of the mind have their effect upon the body. As bodily illness makes man irritable, confused and exhausted in mind, so different conditions of the mind cause health or illness in the body. The link between the body and the mind is the breath, a link through which the influences of the body and the mind are exchanged and work upon one another.

Every passion, every emotion has its effect upon the mind; and every change of mind, however slight, has its effect upon a man's body... One man is perhaps striving all day to earn his own bread so that he may live in a comfortable manner. Another is always worrying about how to maintain himself and his children. Another is thinking, 'What can I do to save my fellow man from his trouble?' If we compare these people, in order to see who is the greatest, we see that he is greatest whose ideal is greatest.

When we consider that great heroes of the past and present, those whom we admire and to whom we look with hope for right guidance, we shall find that what has made them great has been the greatness of their ideal. The lower the ideal, the less the efforts. The higher the ideal, the greater the life. If we use all our intelligence and strength and wisdom to accomplish some little thing, it is only a waste of life. To consider what great things one can accomplish, to seek to do those things which will be most useful and valuable to others, that is the ideal life. ... Come to the mystic, then, and sit with him when you are tired of all these other remedies that you have employed in vain; come and take a glass of wine with him. The mystic wine is the inner absorption, which removes all the worries and anxieties and troubles and cares of the physical and mental plane. All these are now done away with forever. It is the mystic who is at rest. It is he who experiences that happiness which others do not experience. It is he who teaches the way to attain that peace and happiness which are the original heritage of man's soul.