Do not act incautiously when confronting a little bald wrinkly smiling man!

People don't alter history any more than birds alter the sky, they just make brief patterns in it.

And what do you really do? asked Tiffany. The thin witch hesitatied for a moment, and then: We look to ... the edges, said Mistress Weatherwax. There's a lot of edges, more than people know. Between life and death, this world and the next, night and day, right and wrong ... an' they need watchin'. We watch 'em, we guard the sum of things. And we never ask for any reward. That's important.

But ye gotta know where ye're just gonna rush in. Ye cannae just rush in anywhere. It looks bad, havin' to rush oout again straight awa'.

WHAT WOULD HAVE HAPPENED IF YOU HADN'T SAVED HIM? "Yes! The sun would have risen just the same, yes?" NO "Oh, come on. You can't expect me to believe that. It's an astronomical fact." THE SUN WOULD NOT HAVE RISEN. ... "Really? Then what would have happened, pray?" A MERE BALL OF FLAMING GAS WOULD HAVE ILLUMINATED THE WORLD.

I wonder if it's like this for mountain climbers, he thought. You climb bigger and bigger mountains and you know that one day one of them is going to be just that bit too steep. But you go on doing it, because it’s so-o good when you breathe the air up there. And you know you'll die falling.

Don't look back!" "Why not?" "Because I just did! Run faster!