This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...act principle or standard. It is not an easy task; it is not a task that can be performed automatically by one’s feelings, “instincts” or hunches. It is a task that requires the most preci
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...
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