2. Those that deny the happy life to the plants on the ground that they lack sensation are really denying it to all living things. By sensation can be meant only perception of state, and the state of well-being must be Good in itself quite apart from the perception: to be a part of the natural plan is good whether knowingly or without knowledge: there is good in the appropriate state even though there be no recognition of its fitness or desirable quality- for it must be in itself desirable.