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“I learned to recognise the thorough and primitive duality of man; I saw that, of the two natures that contended in the field of my consciousness, even if I could rightly be said to be either, it was only because I was radically both.”
― Robert Louis Stevenson, Dr. Jekyll and Mr. Hyde

“So that in the nature of man,
we find three principal causes of quarrel:

First, Competition;
Secondly, Dissidence;
Thirdly, Glory.

The first, maketh men invade for Gain;
the second, for Safety;
and the third, for Reputation.

The first use Violence, to make themselves Masters of other men's persons, wives, children and cattle;
the second, to defend them;
the third, for trifles, as a word, a smile, a different opinion, and any other sign of undervalue, either direct in their Persons, or by reflexion in their Kindred, their Friends, their Nation, their Profession, or their Name.”
― Thomas Hobbes, Leviathan

“All human beings, as we meet them, are commingled out of good and evil: and Edward Hyde, alone, in the ranks of mankind, was pure evil.”
― Robert Louis Stevenson, Dr. Jekyll and Mr. Hyde

“The source of every crime, is some defect of the understanding; or some error in reasoning; or some sudden force of the passions. Defect in the understanding is ignorance; in reasoning, erroneous opinion.”
― Thomas Hobbes, Leviathan