One of the greatest deeds in life is to admit someone else is right,even if they are not.
What do I mean is you don´t have a need to prove yourself right all the time.
Allow the other person´s opinion to be right no matter how hard it may be.
You don´t need to prove anything...
You don´t need to argue...
You don´t need to be the only one who knows...
Let the other person be right and watch what a difference it makes.
It creates a peace between you.
Even if you know you are 100% right you don´t need to prove others to be wrong.
When you really know something, you only need to know it within.
If opinions of other people change your "inner knowing"...
That´s not knowing at all!