This Krsna consciousness movement is the greatest boon to humanity because it keeps one always engaged in Krsna's service. The devotees think of Krsna, act for Krsna, eat for Krsna, sleep for Krsna and work for Krsna. Thus everything is engaged in the service of Krsna. A total life in Krsna consciousness saves one from material contamination.
Srila Prabhupada; SB 4.30.19 purport