In all warm-blooded creatures, which are the highest evolved and have feelings, passions and emotions, which reach outward into the world with desire, which may be said to really live in the fuller meaning of the term and not merely vegetate - in all such creatures, the currents of the desire body flow outward from the liver.
Everything we do is for the purpose of altering consciousness. We form friendships so that we can feel certain emotions, like love, and avoid others, like loneliness. We eat specific foods to enjoy their fleeting presence on our tongues. We read for the pleasure of thinking another person's thoughts.