" This internal sea. The problem is that this beautiful ocean carries with it loads ay poisonous flotsam and jetsam … that poison is diluted by the sea, but once the ocean rolls out, it leaves the shite behind, inside ma body. It takes as well as gives, it washes away ma endorphins, ma pain resistance centres; they take a long time tae come back. "

― Irvine Welsh , Trainspotting (Mark Renton #2)