St. Silouan of Mt. Athos on Humility

"The first year after I had received the Holy Spirit I thought to myself: ' The Lord has forgiven me my sins: grace is witness thereof. What more do I need?' But that is not the way to think. Though our sins be forgiven we must remember them and grieve for them all our lives, so as to preserve a contrite heart. I did not do this and ceased to be contrite, and suffered greatly from evil spirits. And I was perplexed at what was happening to me, and said: 'My soul knows the Lord and His love. How is it that evil thoughts come to me?' But the Lord had pity on me, and taught me the way to humble myself: 'Keep thy mind in hell, and despair not.' Thus is the enemy vanquished; but when my mind emerges from the fire the suggestions of passion gather strength again.

Fight the enemy with the weapon of humility.

Whoever like me has lost grace, let him wrestle manfully with evil spirits. Know that you yourself are to blame: you fell into pride and vanity, and the Lord in His mercy shows you what it means to be in the Holy Spirit and what it means to be at war with evil spirits. Thus the soul learns by experience the harm that comes of pride, and shuns vainglory and the praises of men, and evil thoughts. Then will the soul begin to recover her health and learn to retain grace. How can we tell if the soul is well or ailing? The ailing soul is full of pride, while the soul that is well loves the humility taught her by the Holy Spirit." - Wisdom from Mount Athos, Chapter 9