  Given the idea that soul is the distinguishing mark of all living things, including plants, the Greek notion of soul is, as we have seen already, broader than our concept of mind. For it is at least conceivable, and probably true as a matter of fact, that there are living (hence ensouled) organisms without minds, without, that is to say, desire and cognition by sense or intellect. (Plato appears to think that plants do have minds in this sense, because he takes them to exhibit desire and sense-perception (Timaeus 77b), but that is presumably supposed to be a matter of empirical fact or inference, rather than simply a consequence of the fact that plants have souls.) 