St. Michael the Archangel, defend us in battle. Be our defense against the wickedness and snares of the Devil. May God rebuke him, we humbly pray, and do thou, O Prince of the heavenly hosts, by the power of God, thrust into hell Satan, and all the evil spirits, who prowl about the world seeking the ruin of souls. Amen..
The importance for Christians to hold the line, that we are born for spiritual combat comes from the Vicar of Christ, Pope Leo XIII (1810 - 1903):
"To recoil before an enemy, or to keep silence when from all sides such clamors are raised against truth, is the part of a man either devoid of character or who entertains doubt as truth of what he professes to believe. The only ones who win when Christians stay "quiet" are the enemies of truth. The silence of Catholics is particularly disturbing because frequently a few bold words would have vanquished the false ideas."
Pope Leo XIII is very clear the importance of giving witness to the truth! Jesus said that He is the "Way, the Truth, and the Life"! That truth is not subject to the human will, but is the height the human will reaches towards. St. Peter gives this explanation:
"but sanctify in your hearts Christ as Lord: being ready always to give answer to every man that asketh you a reason concerning the hope that is in you, yet with meekness and fear: having a good conscience; that, wherein ye are spoken against, they may be put to shame who revile your good manner of life in Christ."