Bhajana-kriya: Kriya means activity. Bhajana means worship, specifically, glorifying the name, fame, and activities of the Personality of Godhead and the spiritual world through the process of hearing and chanting. Bhajana-kriya is a kind work, but it is spiritual work. That is what follows having the association of devotees. We engage in preaching activity in Caitanya Mahaprabhu's movement in order to engage others in the opportunity to hear about Krsna, to have some contact with Krsna in one form or another: Hearing the harinama party, or receiving some recorded message about Krsna in the form of printed literature, or sadhu-sanga, having even brief association with a devotee, because the devotees are carrying the mercy of Krsna to others. They're carrying the mercy of Krsna because they've received the mercy of Krsna. Wherever they go they're carrying Krsna's mercy, and they're distributing it for the purpose of awakening that sraddha in the hearts of whoever may be so inclined to have their understanding or their regard for God strengthened. Then bhajana-kriya follows -- doing more of the same, on one's own or in the company of others: chanting on beads, reading the message of Godhead, discussing spiritual topics with others, contemplating them oneself, etc. The stage that follows that is anartha-nvrttti.
-- adapted from a lecture by Srila Romapada Swami entitled Heart-Cleansing Work, delivered on 9/7/90 in New York