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“He who knows only his own side of the case knows little of that. His reasons may be good, and no one may have been able to refute them. But if he is equally unable to refute the reasons on the opposite side, if he does not so much as know what they are, he has no ground for preferring either opinion... Nor is it enough that he should hear the opinions of adversaries from his own teachers, presented as they state them, and accompanied by what they offer as refutations. He must be able to hear them from persons who actually believe them...he must know them in their most plausible and persuasive form.”
― John Stuart Mill, On Liberty

“The mind is its own place, and in itself can make a heaven of hell, a hell of heaven..”
― John Milton, Paradise Lost

“When we are in love with a woman we simply project on to her a state of our own soul; that consequently the important thing is not the worth of the women but the profundity of the state; and that the emotions which a perfectly ordinary girl arouses in us can enable us to bring to the surface of our consciousness some of the innermost parts of our being, more personal, more remote, more quintessential that any that might might be evoked by the pleasure we derive from the conversation of a great man or even from the admiring contemplation of his work.”
― Marcel Proust, Within a Budding Grove, Part 2

“Consider your origin. You were not formed to live like brutes but to follow virtue and knowledge.”
― Dante Alighieri, The Divine Comedy: Inferno - Purgatorio - Paradiso