The Lord always knocks at the doors of our heart, but the devil knocks at the doors of our mind. Paisios of Mount Athos
Repentance lifts a man up. Mourning knocks at heaven's gate. Holy humility opens it. John Climacus
A pessimist is somebody who complains about the noise when opportunity knocks. Oscar Wilde
He that brings good news, knocks hard. English Proverb
Truth is the club that knocks down and kills everybody. French Proverb
He knocks boldly at the door who brings good news. Italian Proverb