This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...t is rationally appropriate to do so.

This last means that one need not launch into unprovoked moral denunciations or debates, but that one must speak up in situations where silenc
e can objectively be taken to mean agreement with or sanction of evil. When one deals with irrational persons, where argument is futile, a mere “I don’t agree with you” is sufficient to ne gate any implication of moral sanction. When one deals with better people, a full statement of one’s views may be morally required. But in no case and in no situation may one permit one’s ow...
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