prove

"I lost £30 on the bus." "That just goes to prove what an idiot you are!"

“我在公共汽车上丢了30英镑。”“那正好证明了你是个多么愚蠢的傻瓜！”

I wish he'd stop trying to prove himself all the time.

但愿他不要再不停地试图证明自己的实力了。