(Krishna the Supreme Personality of Godhead)
Prabhupāda: jīvera svarūpa haya nitya-kṛṣṇa-dāsa (CC Madhya 20.108-109): we are eternal servant of God. This is our dharma, or constitutional position. Just like sugar is sweet. That is the taste. If sugar is salty, although both of them looks the same, white powder, but if I give you sugar and if it is actually salt, then immediately you will say, "Oh, this is not sugar. This is not sugar." How? By taste. Similarly, everything has got his constitutional position. The sugar is sweet, and the chili is pungent. If sugar is pungent and chili is sweet, then you throw it away. It is not real. It is not real. Similarly, what is the constitutional position of human being, dharma? To serve. This is the constitutional position. Every one of us, we are serving. Without service we have no other business. So this is our constitutional position. But we are serving wrongly; therefore we are not satisfied. This is the position. Caitanya Mahāprabhu therefore begins His philosophy from this point, that jīvera svarūpa haya nitya-kṛṣṇa-dāsa: "The real constitutional position of all living entities is to serve Kṛṣṇa." This is constitutional position.
But unfortunately, being misguided, instead of serving Kṛṣṇa, we are serving so many other things. Somebody is serving his family. Somebody is serving his country. Somebody is serving his dog. In this way, service is there—but the service is misplaced. Therefore we are not satisfied. Why in the material world people are not satisfied? Because his position is to serve Kṛṣṇa. He is serving māyā; therefore he is not happy. Plain thing. Kṛṣṇa says, mamaivāṁśo jīva-bhūtaḥ (BG 15.7): "Jīva, the living entity, they are My part and parcel." So each one of us, we are part and parcel of God. So we have got some duty. Just like the part and parcel of my body has got some duty. The eyes, his duty is to see. The ear, his duty is to hear. So every part of duty, even within, without. So we, being servant, eternal servant of Kṛṣṇa, our only duty is to serve Kṛṣṇa. And because we are not doing that, therefore we are unhappy.
So that duty is called dharma. It is not a kind of faith; it is the constitutional position. You must have to serve. If you don't serve Kṛṣṇa, then you will have to serve māyā. There are two things: God or Satan. So similarly, God is Kṛṣṇa, and Satan is māyā. So if you refuse to serve God, then you have to serve Satan. That's all. You cannot become master.
(Srila Prabhupada Lecture, San Francisco, July 21, 1975)