When a person actually revives his consciousness with thoughts of Krsna by the mercy of Sri Caitanya Mahaprabhu, he revives his spiritual life and becomes addicted to the service of the Lord. Only then can he act as an acarya. In other words, everyone should engage in preaching, following in the footsteps of Sri Caitanya Mahaprabhu. In this way one will be very much appreciated by Lord Krsna and will quickly be recognized by Him. Actually a devotee of Sri Caitanya Mahaprabhu must engage in preaching in order to increase the followers of the Lord. By thus preaching actual Vedic knowledge all over the world, one will benefit all mankind.
Srila Prabhupada, Cc. Madhya 7.153 ppt.