LIVING WELL NEED NOT BE EXTENDED EVEN TO ALL ANIMALS.
2. Those who deny the privilege of living well to plants, because these lack sensation, are not on that account obliged to grant it to all animals. For, if sensation consist in the knowledge of the experienced affection, this affection must already be good before the occurrence of the knowledge. For instance, the being must be in a state conformable to nature even though ignorant thereof. He must fulfil his proper function even when he does not know it. He must possess pleasure before perceiving it. Thus if, by the possession of this pleasure, the being already possesses the Good, he thereby possesses even well-being. What need then is there to join thereto sensation, unless indeed well-being be defined as sensation and knowledge (of an affection or state of the soul) rather than in the latter affection and state of the soul itself?