There are many learned sages, philosophers and transcendentalists who try to conquer the senses, but in spite of their endeavors, even the greatest of them sometimes fall victim to material sense enjoyment due to the agitated mind. Even Visvamitra, a great sage and perfect yogi, was misled by Menaka into sex enjoyment, although the yogi was endeavoring for sense control with severe types of penance and yoga practice. And, of course, there are so many similar instances in the history of the world. Therefore, it is very difficult to control the mind and the senses without being fully Krsna conscious. Without engaging the mind in Krsna, one cannot cease such material engagements. A practical example is given by Sri Yamunacarya, a great saint and devotee, who says: "Since my mind has been engaged in the service of the lotus feet of Lord Krsna, and I have been enjoying an ever new transcendental humor, whenever I think of sex life with a woman, my face at once turns from it, and I spit at the thought."