When the disciple has reached a certain stage, he will become clearly aware that the feeling of sexual lust, if it arises from time to time, is at times something out of his own past, not out of his present state, or an inheritance from parental tendencies impregnated in the body's nervous structure, or at other times something unconsciously transferred to him by another person. He will perceive vividly that what is happening is an invasion by an alien force--so alien that it will actually seem to be at some measurable distance from him, moving farther off as it weakens or coming closer as it strengthens. Therefore he will realize that the choice of accepting it as his own or rejecting it as not his own, is presented him. By refusing to identify himself with it, he quickly robs it of its power over him. The Buddha indeed gave an exercise to his disciples to defend themselves against such invasions by asking them to declare repeatedly, "This is not I. This is not mine."
-- Notebooks Category 5: The Body > Chapter 7 : Sex > # 106
