As stated in Bhagavad-gītā (5.18):

“The humble sage, by virtue of true knowledge, sees with equal vision a learned and gentle brāhmaṇa, a cow, an elephant, a dog and a dog-eater [outcaste].” Paṇḍitāḥ, those who are actually learned — the equipoised, advanced devotees who have full knowledge of everything — do not see any living entity as an enemy or friend. Instead, with broader vision, they see that everyone is part of Kṛṣṇa, as confirmed by Śrī Caitanya Mahāprabhu (jīvera ‘svarūpa’ haya — kṛṣṇera ‘nitya-dāsa’). Every living entity, being part of the Supreme Lord, is meant to serve the Lord, just as every part of the body is meant to serve the whole body.

As servants of the Supreme Lord, all living entities are one, but a Vaiṣṇava, because of his natural humility, addresses every other living entity as prabhu. A Vaiṣṇava sees other servants to be so advanced that he has much to learn from them. Thus he accepts all other devotees of the Lord as prabhus, masters. Although everyone is a servant of the Lord, one Vaiṣṇava servant, because of humility, sees another servant as his master. Understanding of the master begins from understanding of the spiritual master.

“By the mercy of the spiritual master one receives the benediction of Kṛṣṇa. Without the grace of the spiritual master, one cannot make any advancement.”

“The spiritual master is to be honored as much as the Supreme Lord because he is the most confidential servitor of the Lord. This is acknowledged in all revealed scriptures and followed by all authorities. Therefore I offer my respectful obeisances unto the lotus feet of such a spiritual master, who is a bona fide representative of Śrī Hari [Kṛṣṇa].” The spiritual master, the servant of God, is engaged in the most confidential service of the Lord, namely delivering all the conditioned souls from the clutches of māyā, in which one thinks, “This person is my enemy, and that one is my friend.” Actually the Supreme Personality of Godhead is the friend of all living entities, and all living entities are eternal servants of the Supreme Lord. Oneness is possible through this understanding, not through artificially thinking that every one of us is God or equal to God. The true understanding is that God is the supreme master and that all of us are servants of the Supreme Lord and are therefore on the same platform. This had already been taught to Prahlāda Mahārāja by his spiritual master, Nārada, but Prahlāda was nonetheless surprised by how a bewildered soul thinks one person his enemy and another his friend.

As long as one adheres to the philosophy of duality, thinking one person a friend and another an enemy, he should be understood to be in the clutches of māyā. The Māyāvādī philosopher who thinks that all living entities are God and are therefore one is also mistaken. No one is equal to God. The servant cannot be equal to the master. According to the Vaiṣṇava philosophy, the master is one, and the servants are also one, but the distinction between the master and servant must continue even in the liberated stage. In the conditioned stage we think that some living beings are our friends whereas others are enemies, and thus we are in duality. In the liberated stage, however, the conception is that God is the master and that all living entities, being servants of God, are one.