Just like Napoleon constructed strong-built arches, but where he has gone, nobody knows. So therefore Bhaktivinoda Ṭhākura says, sings, jaḍa-bidyā jato māyāra vaibhava tomāra bhajane bādhā. The more we advance in so-called material happiness or material advancement, the more we forget our real identity. This is the result. So we should understand that we have got a separate business, real business. That is called self-realization, that "I am not this body." This is self-realization.