what comes out of our mouth?

Can fresh water and salt water come from the same source? Salt and honey cannot come out of the same tongue, we must be coherent with everything we say, otherwise our tongue will end up broken in two. And I believe that this is something that we all feel, including myself, many times we do not realize the magnitude of what we say. What if we start saying things that make us grow and not wither? What if we start working so that when other people's ears hear us, they feel joy and not sadness?