(Click to enlarge photo of Srila Prabhupada)
Prabhupāda: If one becomes Kṛṣṇa conscious, then brahma-bhūtaḥ prasannātmā (BG 18.54), as soon as he becomes Kṛṣṇa conscious, then he becomes joyful because he has no more enemy. "Everyone is my brothers." Therefore he has no fear. If I become enemy to you, you become my enemy. If I am friendly to you, you are my friend. So a Kṛṣṇa conscious person does not see anyone as something other than son of God. He sees not that only this, this person, is son of God and that person is not son of God. This is lack of Kṛṣṇa consciousness. Every living entity's son of God; therefore one can love, one can actually have the idea of universal brotherhood, only in Kṛṣṇa consciousness, not otherwise. Otherwise, they are simply false propaganda.
Real Kṛṣṇa consciousness, when one achieves, he becomes prasannātmā, joyful. That is the first symptom of becoming full, Kṛṣṇa conscious. Prasannātmā, brahma-bhūtaḥ prasannātmā na śocati na kāṅkṣati (BG 18.54). He has no hankering. He has no lamentation. Samaḥ sarveṣu bhūteṣu. This is the highest stage of Kṛṣṇa consciousness. Samaḥ sarveṣu bhūteṣu. Samaḥ means equality; sarveṣu, "all"; bhūteṣu, "entities." This is third stage. First stage is joyfulness, second stage is no want, no lamentation, and third stage, to see all living entities on the same... Paṇḍitāḥ sama-darśinaḥ (BG 5.18). When one is actually learned, he sees... Mad-bhaktiṁ labhate parām (BG 5.18). Then he becomes eligible to be a devotee of the Lord. To become devotee of the Lord is not so easy. These are the conditions. The beginning is joyfulness.
(Srila Prabhupada Lecture, Hawaii, March 23, 1969)