De Plantatione

and on this account it assigns to us the fruit of the fifth year, because the number five is the number appropriate to the outward sense; and if one must tell the truth, that which nourishes our minds is the outward sense, which by means of our eyes sets before us the distinctive qualities of colours and forms, and by means of our ears presents us with all the various peculiarities of sounds, and with smells by means of the nose, and with tastes through the medium of the mouth, and which enables us to judge of the yielding softness and resisting hardness, or of softness and roughness, or again of heat and cold, by means of the faculty which is dispersed over the whole body, which we usually denominate touch.