- With respect, Professor McGonagall, I'm not quite sure you understand what I'm trying to do here. - With respect, Mr. Potter, I'm quite sure I don't. Unless - this is a guess, mind - you're trying to take over the world? - No! I mean yes - well, NO! - I think i should perhaps be alarmed that you have trouble answering the question.

Rationality is the master lifehack which distinguishes which other lifehacks to use.

After all, if you had the complete decision process, you could run it as an AI, and I'd be coding it up right now.

Remember, if you succeed in everything you try in life, you're living below your full potential and you should take up more difficult or daring things.

Science has heroes, but no gods. The great Names are not our superiors, or even our rivals, they are passed milestones on our road; and the most important milestone is the hero yet to come.

You couldn't changed history. But you could get it right to start with. Do something differently the FIRST time around. This whole business with seeking Slytherin's secrets... seemed an awful lot like the sort of thing where, years later, you would look back and say, 'And THAT was where it all started to go wrong.' And he would wish desperately for the ability to fall back through time and make a different choice. Wish granted. Now what?

You will find ambiguity a great ally on your road to power. Give a sign of Slytherin on one day, and contradict it with a sign of Gryffindor the next; and the Slytherins will be enabled to believe what they wish, while the Gryffindors argue themselves into supporting you as well. So long as there is uncertainty, people can believe whatever seems to be to their own advantage. And so long as you appear strong, so long as you appear to be winning, their instincts will tell them that their advantage lies with you. Walk always in the shadow, and light and darkness both will follow.