Humility is a divine shelter to prevent us from seeing our achievements. Humility is an abyss of self-abasement, inaccessible to any thief. Humility is a strong tower against the face of the enemy. The enemy shall not prevail against him, nor shall the son, or rather, the thought of iniquity do him evil: and he will cut off his enemies from his face and will conquer them that hate him.
Based on St. John of the Ladder
A monk makes a big prostration asking for forgiveness before going to receive Holy Communion