Now, this research work about the science of God has to be prosecuted for several births after births... God realization, it is very easy, but at the… - A. C. Bhaktivedanta Swami Prabhupada

Basically we have not got hatred for anyone, but when one is demoniac or atheistic, we should try to avoid their company. A preacher’s business is to love God, to make friendship with devotees, to enlighten the innocent, and to avoid the demons. This principle we shall follow.

Materialistic people are sometimes called sudras, or descendants of monkeys, due to their monkey like intelligence. They do not care to know how the evolutionary process is taking place, nor are they eager to know what will happen after they finish their small human life span. This is the attitude of sudras. Sri Caitanya Mahaprabhu’s mission, this Krishna consciousness movement, is trying to elevate sudras to the brahmana platform so that they will know the real goal of life. Unfortunately, being overly attached to sense gratification, materialists are not serious in helping this movement. Instead, some of them try to suppress it. Thus it is the business of monkeys to disturb the activities of the brahmanas.

That is taught by Caitanya Mahāprabhu, that "Whatever You do . . . "Either You trample Me under Your feet or You embrace Me . . . whatever You like. You make Me brokenhearted by not seeing You—that doesn't matter. Still You are My worshipable Lord." That is love. "From God's side, He may do whatever He likes. I don't want anything in exchange." That is love. That sort of love Kṛṣṇa wants. Therefore He was so much fond of the gopīs. In the gopīs' love there was no question of business propaganda—"Give me this, then I love You." (chuckles) No. That is pure love. That is unalloyed love. Ahaituky apratihatā. Apratihatā means without being checked. No impediment. If you want to love God, there is nothing throughout the whole world which can check you. Simply you have to develop your eagerness: "Kṛṣṇa, I want You." That's all. Then there is no question of checking. In any condition, you'll increase your love, increase your love.