For, if you do not do this, you will be carried over to the other side in spite of yourself. If you do not reprove and separate yourself from what is sinful, you will join in it. Your own experience ought to show you that. Your effort to be neither the one thing nor the other, neither God's servant nor the devil's, always has been in vain and always will be. For the Eternal Truth has said, "He that is not with me is against me."
Yes, my brethren, it is certain that if you will not confess Christ boldly and openly before men; if you will not acknowledge that his faith and his morals are yours also; if you will not bravely and generously take his part in the great battle which he is fighting in this world, and in which he has enlisted you to fight under him; but if, on the other hand, you sneak off into a corner and stay there as long as his enemies are in sight, he will not count you as his servants or friends, and you will not be so, either in this world or in the world to come. "He that shall deny me before men, I will also deny him before my Father who is in heaven." And if you will not confess him, you must deny him; there is no middle course.
Be not, then, runaways, but brave soldiers in the conflict to which you are called. The enemies of Christ are not afraid to let their principles be known; if you would imitate their example the tables would be turned. They would be ashamed of themselves, if you would not be; and it is they who ought to be ashamed, not you. Moreover, God would get the glory which belongs to him, and if you will not give it to him you cannot expect him to save your mean and cowardly souls.
_What went you out into the desert to see? a reed shaken with the wind?_ --St. Matthew xi. 8. --usccb.org/bible: St. Matthew xi. 7
In these words, my dear brethren, our Lord holds up the character of his great precursor, St. John Baptist, as a model for the imitation of his disciples, and also for our imitation. "St. John is not like a reed shaken with the wind; see that you follow his example"--that is the meaning and the lesson of this question asked by our Lord.
St. John, indeed, was not like a reed shaken with the wind. He was rather like a massive column of stone, which is not moved a hair's-breadth from its place by the most furious storms. He was firm and unyielding to all the assaults of temptation. Born free from original sin, he persevered without actual sin through the whole of his glorious life.