A.C. Bhaktivedanta Swami Prabhupāda, Bhagavad-Gita As It Is Quotes

Religion without philosophy is sentiment, or sometimes fanaticism, while philosophy without religion is mental speculation.

Out of many thousands among men, one may endeavor for perfection, and of those who have achieved perfection, hardly one knows Me in truth.

Because materialists cannot understand Krsna spiritually, they are advised to concentrate the mind on physical things and try to see how Krsna is manifested by physical representations.

For man, mind is the cause of bondage and mind is the cause of liberation. Mind absorbed in sense objects is the cause of bondage, and mind detached from the sense objects is the cause of liberation.