Enlightenment starts when you reach from "Ahamkar" (ego) to "Asmita" (awareness). From that zero level, an enlightened person becomes a 'witness', starts observing everything. In that process "Ahamkar" (ego) becomes less and less. You come to "Asmita". In "Asmita" also witness action is there. 'I' am witnessing 'you'. So, 'I' am is different and 'you' are different and witnessing 'you' is different; God is different. You have a jump forward and therefore 'I-you' distinction goes. 'Dwaita' (duality) completely goes and you become 'adwaita' (non-dual). You become absolute. You are a realized soul.

Enlightenment is the beginning, realization is the end. In enlightenment, light has started; in self-realization you become the light.