"This humbleness is very good in devotional service. Therefore Caitanya, Sri Krsna Caitanya Mahaprabhu teaches us: trnad api sunicena taror api sahisnuna. One should be tolerant than the trees and humbler than the grass to make progress in spiritual life. Because there will be so many disturbances. Because maya... We are living... Just like if we are in the ocean. So you cannot expect very peaceful situation in the ocean. It must be always tilt, what is called, tiltering, tilting. Even, even a big ship, it is also not very fixed up position. At any moment there may be tumultuous waves. So in this material world you should always expect danger. You cannot expect very peaceful life within this material world. Padam padam yad vipadam. Sastra says in every step there is danger. But if you become a devotee, then you escape."
(Srila Prabhupada lecture, New York, April 12, 1973)