Now a word is twofold; internall, and uttered; An internall word is a conception of the mind, and motion of the soul, which is made without a voice. As in dreams we seem to speak, and dispute with our selves, and whilest we are awake we run over a whole speech silently. But an uttered word hath a certain act in the voice, and properties of locution, and is brought forth with the breath of a man, with opening of his mouth, and with the speech of his tongue, in which nature hath coupled the corporeall voice, and speech to the mind, and understanding, making that a declarer, and interpreter of the conception of our intellect to the hearers....
Henry Cornelius Agrippa
of Speech & The Virtue of Words