Similes prove nothing, but yet greatly lighten and relieve the tedium of argument.

Men's arguments often prove nothing but their wishes.

He was a relieved man; he was an angry man.

Nothing discovered yet has been shown to stop or slow down aging.

I don't think the clock is ticking yet for Arturo, but there is a clock. He has something to prove. He has to win, and he has to look impressive doing it.

I have been in there with all of them and there is nothing left for me to prove.