I need a quote translated from english to Latin for a tattoo

Life has meaning only in the struggle.
Vita significationem sole in certamine habet.

Victory or defeat lies in the hands of God.
Victoria aut clades in manibus Dei est.

So let us celebrate the struggle.
Ergo certamen celebremus.

NOTE: by "back piece" I assume you mean a tattoo. Please have someone
else review this before committing it to ink. I'm not a professional Latin
scholar, just a guy who does this for fun.

Thank you man. I do mean a tattoo. I appreciate your help!

You're welcome, cgoodman.