The fact that man knows right from wrong proves his intellectual superiority to the other creatures; but the fact that he can do wrong proves his moral inferiority to any creatures that cannot.
Mark TwainThe most permanent lessons in morals are those which come, not of book teaching, but of experience.
Mark TwainThere is more real pleasure to be gotten out of a malicious act, where your heart is in it, than out of thirty acts of a nobler sort.
Mark Twain