If we become Kṛṣṇa conscious, if we take teachings of Bhagavad-gītā, Kṛṣṇa consciousness, Kṛṣṇa says, sarva-yoniṣu kaunteya sambhavanti mūrtayo yāḥ (BG 14.4)
"In all species of life, in all forms of life, as many creatures are there, they are all My sons." So how can you treat others as not your brother? They are also your brother. Even the ant is also your brother. He is in a different class of imprisonment, that's all. A different body. The ant has got also the same punishment—birth, death, old age and disease—as you have got. You are also criminal; he is also criminal. But he is also son of God; you are also son of God. This is Kṛṣṇa consciousness.
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 brother." 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 is 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).