Till we have this material body we will always be, samudvigna, full of anxiety. Once we come into the realm of knowledge this anxiety will be destroyed. If this anxiety is destroyed but we do not advance! Just like if a man is suffering from fever and the fever subsides, but the fact that the fever has subsided does not mean that his body is disease free. Only if he gets out of the bed, walks around, eats properly and feels good only then can we say that he is healthy. Just the fever subsiding is not the goal. Similarly if we just acquire knowledge, Aha brahmâsmi, I am Brahman, I am not this material body, this is not sufficient knowledge. That is why the Lord says, bahḻnâ janmanâm ante jsânavân mâprapadyate, one who is in possession of knowledge, this kind of devotional service is obtained after many many births, bahḻnâ janmanâm ante jsânavân mâprapadyate, to surrender at the lotus feet of the Lord- that is real knowledge. With just knowledge we may be blissful, but till we surrender at the lotus feet of the Lord, the knowledge is not complete, this is according to the scriptures. That is why it is said in the Bhagavad-gita,
brahma-bhutah prasannatma na socati na kanksati samah sarvesu bhutesu mad-bhaktim labhate param (BG 18.54)
Those who have acquired knowledge and are joyful, that I am not material, Aha brahmâsmi, So’ham this is all right but if you do not advance, then you will fall down. Then you will fall down from the realm of knowledge. This is an injunction of the scriptures.