Our Lord Jesus Christ, who “untied the works of the devil” (1 Jn. 3: 8) by His humility, had shown us the most powerful weapon against the spirits of wickedness under the heaven. The whole earthly life of our Savior is a powerful and unprecedented example of humility. His descent from His heavenly throne on this corrupted earth, His birth in a manger, His upbringing that remained unnoticed in the mysterious city of Nazareth, His obedience without murmuring against others, His complete service to others to the ultimate self-sacrifice on the Cross, the washing of His disciples’ feet, His Passion and death on the cross; all bear witness to His perfect humility. But our Savior humility indebted us to follow in His deeds “I gave you an example, that as I have done to you, ye should do to others” (Jn. 13:15) He told his disciples after He washed their feet.

He who humbles himself lays down the very foundation of a moral, righteous life. If a man engages in various spiritual labors without humility, but overcome by pride, then sooner or later, he will fall. Only the struggles and works erected on the foundation of deep humility will not be shaken. The higher the building that we want to raise, the more we ought to deepen its foundations. So it happens in the spiritual life. The more we desire to be raised closer to God, the more we ought to humble ourselves.

The power of the devil resides in pride, so his undoing. He is strong by his pride, but only before the proud, as only over those he has power.
Before the deeply humbled man, his pride proves a weak weapon. The ice can be very hard, but only during frosty weather. When the sun warms it up, then the hard ice begins to melt. Likewise the devil pride proves helpless before the humility of those truly pleasing to God. By their humility, they evince to be the bravest warriors.
Isn’t this the true bravery? to be reviled, and not to not avenge, to forgive and to overcome evil with good? (Rom. 12:21)
(Archimandrite Seraphim Alexiev, “The spiritual life of the Orthodox Christian”)