It's time for the share-your-favorite-PiHKAL/TiHKAL-quotes game! They can be inspirational, funny, profound, educational, completely out of context... As long as they are quoted from PiHKAL or TiHKAL.
I'll start:
Quote:The erection of my nipples is almost painful.
- TiHKAL, #34. 2-ME-DMT

Let's hear 'em!