Do you believe the phrase, "If you can write it you can say it"?

I am realizing and/or I forgot… That all languages are not made equal. I don’t foresee any issues with speaking the way one writes in English or Spanish as problematic. In English, in my experience being a native, it is even encouraged to speak in the same manner one writes. In fact, it is the proclaimed ideal. I happy for Evgueny40 comment, with Russian being my next language, I happy to be able to expect some similarities.