Egoism

Webster's Dictionary

(1): ( n.) The doctrine of certain extreme adherents or disciples of Descartes and Johann Gottlieb Fichte, which finds all the elements of knowledge in the ego and the relations which it implies or provides for.

(2): ( n.) Excessive love and thought of self; the habit of regarding one's self as the center of every interest; selfishness; - opposed to altruism.

The Nuttall Encyclopedia

The philosophy of those who, uncertain of everything but the existence of the Ego or I, resolve all existence as known into forms or modifications of its self-consciousness.