Prabhupāda: Yes, there are two different processes of acquiring knowledge. One process is to research oneself by his own endeavor, by his limited sense speculation. And another process is to know from the authority. Just like deductive process, we say, man is mortal. This knowledge is received from higher authorities, just like our teacher or parents, we understand that man is mortal. Another process is one can make research whether actually man is mortal.
Caller: Well, is there some kind of a spiritual signal you get within yourself that tells you this?
Prabhupāda: No, your question is what I am? So this what I am, you can search yourself by your mental speculation, that is one way. Another way to understand your position, from higher authority. So we take this process. We understand what I am from higher authority, Kṛṣṇa. Kṛṣṇa says that He is God, and He says, "All these living entities are My part and parcels." So we are component parts of the Supreme Lord. Therefore as the component part of machine is to cooperate with the full machine, so our duty is to cooperate with the Supreme Lord. That is our identity.