Are you a hero, actually?”
“Um, no. Not as such. Not at all, really. Even less than that, in fact.

It's vital to remember who you really are. It's very important. It isn't a good idea to rely on other people or things to do it for you, you see. They always get it wrong.

How can you protect yourself by carrying a sword if you don’t know how to use it?’
Not me, sir. Other people. They see the sword and don’t attack me,’ said Maladict patiently.
Yes, but if they did, lad, you wouldn’t be any good with it,’ said the sergeant.
No, sir. I’d probably settle for just ripping their heads off, sir. That’s what I mean by protection, sir. Theirs, not mine. And I’d get hell from the League if I did that, sir.

Yes! I'm me! I am careful and logical and I look up things I don't understand! When I hear people use the wrong words, I get edgy! I am good with cheese. I read books fast! I think! And I always have a piece of string! That's the kind of person I am!

A man can learn all of an opponent's weaknesses on that board,' said Gilt.
'Really?' said Vetinari, raising his eyebrows. 'Should not he be trying to learn his own?

If you do not know where you come from, then you don't know where you are, and if you don't know where you are, then you don't know where you're going. And if you don't know where you're going, you're probably going wrong.