Il parle en connaissance de cause = He knows what he is talking about.

Je ne veux pas y aller et pour cause = I do not want to go there, and for a very good reason.

J'ai toujours pris fait et cause pour vous = I have always stood up for you, taken up the cudgels in your defence.

Il a eu gain de cause = He gained the day.

Un avocat sans cause = A briefless barrister.

Vous êtes hors de cause = You are not concerned in the matter; This has nothing to do with you.