The holy name of Krishna has extraordinary spiritual potency because the name of God is nondifferent from God Himself.
The genuine Guru is God's representative and he speaks about God and nothing else.
Spiritual master is representative of God. Similarly, king is also representative of God. The father is also representative of God. These are the statements of the sastras. Because they will guide. The king will guide. The spiritual master will guide. The father will guide. What is that guidance? That guidance is how one can become Krishna Conscious by education, by culture.
The Srimad-Bhagavatam states that any bona fide preacher of God consciousness must have the qualities of titiksa (tolerance) and karuna (compassion). In the character of Lord Jesus Christ we find both these qualities.