"When we dovetail with the desire of the Supreme Lord, then our responsibility becomes more imperative, and we become more active than we are otherwise. In material activity you will get tired. This is the difference between material activity and spiritual activity. When you are engaged in spiritual activities, you'll not get tired. You have newer and newer strength to act. Therefore, desire is not to be stopped; activities are not to be stopped. Whatever potency you have in you, that is the potency given by the Supreme Lord, because you are the part and parcel of the Supreme Lord. Therefore, all the potencies that you have, they are also part and parcel of the Supreme Lord. And if you utilize them for the purposes of the Supreme Lord, then you become dovetailed with Him, and your life becomes successful. You'll not be disturbed by material desires, you'll attain peace. The peace for which you are hankering in life after life, moment after moment-that you'll get at that time, when your desires are purified, and dovetailed with the Lord. One who desires sense gratification, the enjoyment of material satisfaction, will never be happy. That is not possible. If you want peace, if you want happiness, if you want perfection in your life, then just begin to dovetail your desires, activities, and potentials with the Supreme Personality of Godhead. Then you will see what real happiness is, and can tell who is really crazy." (Srila Prabhupada in a lecture)