The enemy of sense, of wisdom, is the lack of tranquillity of mind. When the mind is tranquil it produces the right thought, and wisdom naturally rises as a fountain. The Sufis have therefore taught different exercises, both in physical and in meditative form, in order to make the mind tranquil, so that the wisdom which is there may spring up as a fountain. It is not in disturbed water that one can see one's image reflected; it is in the still water that one can see one's image clearly. Our heart is likened to water, and when it is still wisdom springs up by itself. It is wisdom and will together that work towards a successful issue.