The Atma can be grasped only by a sharpened intellect and a pure mind. How to purify the mind? By starving it of the bad food it runs after, namely objective pleasure and feeding it on the wholesome food, namely, the thought of God. The intellect too will be sharp, if it is devoted to discrimination between the transient and the eternal. Let your thoughts be concentrated on God, His Name and His Form; you will then find that you are always with the pure and the permanent; you will then derive rive pure and permanent joy. That is the reason why I attach so much importance to Namasmarana as a sadhana. (SSS Vol.5, p. 9)