Even after the Truth has been realised, there remains that strong, obstinate impression that one is still an ego - the agent and experiencer. This has to be carefully removed by living in a state of constant identification with the supreme non-dual Self. Full Awakening is the eventual ceasing of all the mental impressions of being an ego.
Adi ShankaraDo not look at anybody in terms of friend or foe, brother or cousin; do not fritter away your mental energies in thoughts of friendship or enmity. Seeking the Self everywhere, be amiable and equal-minded towards all, treating all alike.
Adi ShankaraThere is sorrow in finitude. The Self is beyond time, space and objects. It is infinite and hence of the nature of absolute happiness.
Adi ShankaraBut the jiva [living being] is endowed with ego and his knowledge is limited, whereas Ishwar is without ego and is omniscient.
Adi ShankaraFrom a clear knowledge of the Bhagavad-gita all the goals of human existence become fulfilled. Bhagavad-gita is the manifest quintessence of all the teachings of the Vedic scriptures.
Adi Shankara