I Do Love This Quote

‘It’s a bad case o’ the thinkin’ he’s caught, missus. When a man starts messin’ wi’ the readin’ and the writin’ then he’ll come doon with a dose o’ the thinkin’ soon enough. I’ll fetch some o’ the lads and we’ll hold his heid under water until he stops doin’ it, ‘tis the only cure. It can kill a man, the thinkin’.

From, of course, Terry Pratchett (since the image doesn't say).