This is proper utilization of energy. When the energy of Kṛṣṇa, the spiritual energy of Kṛṣṇa or the living entity, works for Kṛṣṇa, that is healthy condition. Just like part and parcel of my body, this finger. When this finger works for me... I want the finger: "Come here. Work some here." But if the finger is not in healthy condition, it is painful, it cannot work, that is not normal condition. The normal condition is the finger is to work for my body. Similarly, we, being part and parcel of Kṛṣṇa, when we are engaged in Kṛṣṇa's service, that is our normal condition, our healthy life. Therefore Kṛṣṇa says that "These foolish creatures, mūḍhāḥ, who are thinking that 'We shall work for sense gratification,' they are mūḍhas." Na māṁ duṣkṛtino mūḍhāḥ prapadyante narādhamāḥ (BG 7.15). The animals cannot understand this constitutional position of the living entity. Because this material world means all the living entities, they have come here for satisfying their senses. And in different grades of life they are satisfying their senses. Either as Brahmā or the worm in the stool, they are satisfying their senses, different senses. That is material life. And when one understands that "I am part and parcel of Kṛṣṇa. My duty is to serve Kṛṣṇa," that is normal life. That is actually spiritual life. Sevonmukhe hi jihvādau svayam eva sphuraty adaḥ (Brs. 1.2.234). When we forget to serve Kṛṣṇa, that is material life. And when we serve Kṛṣṇa with love and affection, understanding that we are very intimately related, part and parcel, that is spiritual life.
This is the difference between material life and spiritual life. When one works for his own sense gratification, that is material life. And when works for Kṛṣṇa's satisfaction, that is spiritual life. That is spiritual life. It is very easy to understand. We are working, we are servant of somebody. All these people who have gathered here, nobody can claim that "I am not servant." Everyone is servant—servant of the society, servant of the family, servant of the country, servant of dog, servant of cat. Everyone is servant. That is misplacement. But actually he is servant of Kṛṣṇa. When he forgets that he is servant of Kṛṣṇa, he becomes servant of so many māyā. But when he understands that "I am servant of Kṛṣṇa, and, becoming servant of Kṛṣṇa, I can become servant of others also," that is called Kṛṣṇa consciousness. This is the movement of Kṛṣṇa consciousness. Everyone is a servant, but he is serving wrongly. His service is misplaced. We are simply educating people that "Your service being misplaced; therefore you are not satisfied, neither your master is satisfied. Nobody's satisfied." For example... I have repeated this example many times. Even Mahatma Gandhi, the great servant of India He served India so nicely. Still, the master was not satisfied, and the master killed him. He wanted to serve his country, but the result was that his countrymen killed him.
So this service is frustration. If you go on serving the material world, you'll be frustrated, in this way or that way. But if you serve Kṛṣṇa, the same service applied to Kṛṣṇa, your life will be successful. That is Kṛṣṇa consciousness movement, that ser..., you cannot avoid service, but service other than Kṛṣṇa will be frustration. But you serve Kṛṣṇa, you'll be satisfied, the Supreme Lord will be satisfied, and your life will be successful.