2. The Tree of Life II

Hence arises this fact also: we gain knowledge from waking up to going to sleep, but the moment we go to sleep, it ceases to be in our consciousness, that is to say, it goes out of our ego. Philosophers who make the ego the basis of philosophy and then say: We can make the ego the foundation of philosophy because it is the permanent thing in human life between birth and death, utter a very common absurdity; for the ego, as man experiences it, is extinguished every night. So let us hold these facts before us; that we gain knowledge, that knowledge is however gained through the ego, and the ego is extinguished for our condition between falling asleep and awaking.