I don't need to. The burden of proof is on the one who has made the assertion -- that's you.
But, you see, it really does not matter to me whether or not you believe or agree with me. So I have no need to prove it. There are some things you just have to discover for yourself. It does not bother me that you do not agree. Why does it bother you that I believe that aikido is everything and everything is aikido?