Latin Translation

Hello,

I was named caption of my football team and I am trying to come up with a slogan for this year's training camp. Something cool that we can put on a tshirt.

I was hoping to get something in Latin. I was thinking about:

"Prove Yourself Worthy" in latin, as our summer's motto.

I know that it may be impossible to translate, but does anyone think they could help?

Thanks,
Brian