Kabbalah recognizes four basic levels of life: mineral, plant, animated and human. Each of these four, has a special Hebrew name which conveys something of it's essence. In the case of the human level, the special name is "mih-dah-ber", which literally translates into English as "speaker". Until today, I wondered why humans are referred to as "speakers" and not as "thinkers".
Then today, I heard a science radio program which presented studies on speech. It turns out that without speech, there's no real thinking as we know it. Now, this does not necessarily have to be verbal speech. The studies showed that there was a marked improvement in thinking among deaf people as they develop in their understanding and usage of sign language. So any style of speech supports the whole thinking process and builds it up.
Now I understand why we're referred to as "speakers". It's obvious that we could never become "thinkers" if we weren't first "speakers".