The single most important thing for an unusually intelligent person to understand is that you can be the smartest person who ever lived—the envy of Newton, Aristotle, Goethe, and Da Vinci—and still be a complete fucking idiot. You’re human, and one of the things humans do is base their feelings of self-worth on comparisons with other people. Understanding the distinction between relative ability, of which you may have a great deal, and absolute ability, of which you certainly have very little, will protect you from many of the most common errors. You may wish relearn this lesson empirically, which is to say the hard way, but you will save yourself and the people around you a great deal of unnecessary trouble by taking my word for it. Always be on guard against the appearance of megalomania and train yourself in humility by meditating on the moral commandments in the New Testament. If you catch yourself thinking in terms of your impact on the course of history, that’s a pretty good sign that the megalomania is kicking in. Stop whatever you’re doing immediately and read your Bible until you feel normal again, because you’re probably about to fuck up in a big way.
(And if you’re thinking “it’s not megalomania when I really am changing history”…then no whining that nobody warned you about hubris.)