Being silent when it is our duty to speak out is a sin. Everyone “is bound to give the admonition when the sin, committed though it be from ignorance, is hurtful to the offender or a third party or is the occasion of scandal.” (St. Augustine)
“The greatest kindness one can render to any man consists in leading him from error to truth.” (St. Thomas)
"Thou shalt not hate thy brother in thy heart, but reprove him openly, lest thou incur sin through him” (Leviticus 19:17).
“He must know that he who causeth a sinner to be converted from the error of his way, shall save his soul from death, and shall cover a multitude of sins” (James 5:20).
Jesus - “If thy brother sin against thee, reprove him: and if he do penance, forgive him” (Luke 17:3).
“Them that sin reprove before all: that the rest also may have fear” (1 Timothy 5:20).
“Preach the word: be instant in season, out of season: reprove, entreat, rebuke in all patience and doctrine” (2 Timothy 4:2).
“Brethren, and if a man be overtaken in any fault, you, who are spiritual, instruct such a one in the spirit of meekness, considering thyself, lest thou also be tempted” (Galatians 6:1).
It is a grace from God to be corrected, a grace that should be thankfully and humbly accepted the moment it is offered to us. “The way of a fool is right in his own eyes: but he that is wise hearkeneth unto counsels” (Proverbs 12:15).
“If we say that we have no sin, we deceive ourselves, and the truth is not in us.” (1 John 1:8)
“The sentence ‘Judge not, that ye be not judged’ is usually quoted out of context. Christ did not enjoin us to refrain from ever judging. What he went on to say in the next four verses is that we should judge ourselves before we judge others–not that we shouldn’t judge at all.
“I came not to send peace, but the sword” (Matt. 10:34), we should be warriors of Christ. The holy Church on earth is called ecclesia militaris (“the Church militant”). We cannot at the same time hunger and thirst after justice—an inherent basic attitude of the true Christian—and be at universal peace with the doers of evil and the unjust.
St. John goes so far as to advise the faithful against greeting heretics (2 John 10-1)
If a person is doing wrong, and you tell him in a kind manner, a charitable manner, that they are committing a sin, and that they will lose their soul and go to purgatory, or even hell, that is not judging. You are helping and loving your neighbor.
The Ten Commandments have been replaced with what Alan Wolfe refers to as America’s Eleventh Commandment: Thou shalt not judge.
