If you love Christ God, then endure as He endured, and do all that is pleasing to Him. He taught and did. Unfailingly your love also should be such as does good, endures, is disturbed by nothing present, and in everything ever thanks Him not with words and tongue, but with very deeds. You must love Him with heart, with mind, with your whole soul, strength, and mind.
Saint Nazarius of Valaam, Little Russian Philokalia, Vol. II