…The process of meditation recommended in the Śrīmad-Bhāgavatam is not to fix one’s attention on something impersonal or void.
The process of meditation should begin from the lotus feet of the Lord and progress to His smiling face. The meditation should be concentrated upon the lotus feet, then the calves, then the thighs, and in this way higher and higher. The more the mind becomes fixed upon the different parts of the limbs, one after another, the more the intelligence becomes purified. (SB 2.2.13)
Śrīmad-Bhāgavatam
By His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda
Canto Two, Chapter 2, Text 13-14
The Hare Krishna Movement 