Creo que tienes razón.
I believe you are right.
Tiene razón.
He/She is right.
Sé que tienes razón.
I know you are right.
Es presuntuoso pensar que siempre tienes la razón.
It's presumptuous to think that you are always right.
No debes presumir que siempre tienes la razón.
You shouldn't presume that you are always right.