French phrase
Je suis convaincu que ~.
Meaning
I am convinced that ___.
When to use it
Expresses strong conviction about a view or decision. It is a somewhat formal way to support a position or judgment persuasively.
Example dialogue
Je suis convaincu que c'est la bonne décision.
I am convinced that this is the right decision.
Très bien, alors nous avançons selon ce plan.
Very well, then let's proceed according to this plan.