Plant an expectation; reap a disappointment." (Quoting an old adage)

There is an Italian proverb which saith, From my enemy let me defend myself; but from a pretensed friend Lord deliver me

Yuyeh sesh. Despise your heart. Ni weh sesh. I have no heart.

An apple a day keeps the doctor away.

In Shoshone, there's a saying. It's a long one, and it doesn't have an English equivalent, so bear with me.

Sutummu tukummuinna. It means, I don't speak your language, and you don't speak mine. But I still understand you. I don't need to walk in your footsteps if I can see the footprints you left behind.

Always borrow money from a pessimist. He won't expect it back.