No advocate of reason can claim the right to force his ideas on others. No advocate of the free mind can claim the right to force the minds of others. No rational society, no co-operation, no agreement, no understanding, no discussion are possible among men who propose to substitute guns for rational persuasion.

For the New Intellectual: The Philosophy of Ayn Rand (50th Anniversary Edition) (ed. Penguin, 1963) - ISBN: 9781101137680