Bhakta Dasa : When Srila Prabhupada was asked, "What is humility?" he said, "Humility is to act boldly for Krishna." We may think that humility is to be meek, quiet, or submissive. But no, Prabhupada said, "Be bold for Krishna."
Reference:Memories-Anecdotes of a Modern-Day Saint by Siddhanta Dasa