This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...se, the most exacting, the most ruthlessly objective and rational process of thought. It is fairly easy to grasp abstract moral principles; it can be very difficult to apply them to a given situ
ation, particularly when it involves the moral character of another person. When one pronounces moral judgment, whether in praise or in blame, one must be prepared to answer “Why?” and to pr
ove one’s case — to oneself and to any rational inquirer.
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The policy of always pronouncing moral judgment does not mean that one must regard oneself as a missionary charged wit...