In my book, Seven Steps to Inner Power:
"Continue for yourself, now. Ask, What idea is lacking when I feel sorrow? When I feel shy? When I feel anger? When I feel jealous? Go down your personal list and fill these voids with the pure ideas belonging to your Real Self.
Doesn’t a healthy immune system operate on the principle of constantly distinguishing between self and not self, and then eliminating what is not self? Your mental immune system is your mental purity, the constant attention you give to which thoughts are Self (the Silent Master) and which are not Self (negative and limited). When you express purity, you express the pure power and knowing of your Silent Master. You express your Real Self!"
Purity leads to Love.