If a man believes that the good is a matter of arbitrary, subjective choice, the issue of good or evil becomes, for him, an issue of: my feelings or theirs? No bridge, understanding, or communication is possible to him. Reason is the only means of communication among men, and an objectively perceivable reality is their only common frame of reference; when these are invalidated (i.e., held to be irrelevant) in the field of morality, force becomes men’s only way of dealing with one another.

- Ayn Rand. Capitalism: The Unknown Ideal (1966).