“Since Krishna is the cause of all causes, He is worshiped by all kinds of sages and saints by observance of the regulative principles. When there is a necessity for meditation, great personalities meditate on the transcendental form of Krishna within the heart. In this way the minds of great personalities are always engaged in Krishna.” (Shrila Prabhupada, Krishna, The Supreme Personality of Godhead, Vol 2, Ch 32)