"An old poacher makes the best gamekeeper."

> buy petrol in litres

And use miles per gallon for fuel economy...

A wise man does not build his house on another man's land.

A wise man doesn't allow unilateral changes of contract terms. It will be a good, and hopefully not too expensive, business lesson.

>And in contrast, he invokes the worst thing he can think of: hurting someone's livelihood.

>Livelehood: a means of supporting one's existence, especially financially or vocationally

Just a small thing.