Glorious Saint Michael, Prince of the heavenly hosts, who stands always ready to give assistance to the people of God; who fought with the dragon, the old serpent, and cast him out of heaven, and now valiantly defends the Church of God that the gates of hell may never prevail against her, I earnestly entreat you to assist me also, in the painful and dangerous conflict which I sustain against the same formidable foe.
Be with me, O mighty Prince! that I may courageously fight and vanquish that proud spirit, whom you, by the Divine Power, gloriously overthrew, and whom our powerful King, Jesus Christ, has, in our nature, completely overcome; so having triumphed over the enemy of my salvation, I may with you and the holy angels, praise the clemency of God who, having refused mercy to the rebellious angels after their fall, has granted repentance and forgiveness to fallen man. Amen.
Source: EWTN
Wisdom and prayers of saints 