As stated in Caitanya-caritāmṛta (Madhya 22.54):
‘sādhu-saṅga’, ‘sādhu-saṅga’ — sarva-śāstre kaya
lava-mātra sādhu-saṅge sarva-siddhi haya
It is a fact that if one takes shelter of a pure devotee, one attains all perfection, even if the association is a short one. A sādhu is a pure devotee of the Lord. It has been our practical experience that the first instruction of our spiritual master infused us with Kṛṣṇa consciousness so that now we are at least on the path of Kṛṣṇa consciousness and can understand the philosophy. As a result, there are many devotees engaged in this Kṛṣṇa consciousness movement. The whole world is revolving under the bodily conception; therefore there must be devotees all over the world to deliver people from the false bodily conception and fully engage them in Kṛṣṇa consciousness.