In order to make thought fruitful mental culture is necessary; first the digging of the ground. The inner culture of the Sufis begins with the digging of this ground. What is meant by Zikr is this digging process. But it is not only the exercise, it is living the life. Digging the ground is what may be called consideration. It is constant consideration which cultivates the mental ground. Then one must water this ground, and this water is the love element, to give and to receive love. Give more and take little is the principle. And when in a ground so cultivated and so watered the thought-plants will spring, they must necessarily bring forth sweet fruits and fragrant flowers.