TO worship God even for the sake of salvation or any other reward is equally degenerate. Love knows no reward. Give your love unto to God, but do not ask anything in return even from Him through pray.
Renunciation - non-resistance - non-destructiveness - are the ideals to be attained through less and less worldliness, less and less resistance, less and less destructiveness. Keep the ideal in view and work towards it. None can live in the world without resistance, without destruction, without desire. The world has not come to that state yet when the ideal can be realised in society.
Plunge into the world, and then, after a time, when you have suffered and enjoyed all that is in it, will renunciation come; then will calmness come. So fulfill your desire for power and everything else, and after you have fulfilled the desire, will come the time when you will know that they are all very little things; but until you have fulfilled this desire, until you have passed through that activity, it is impossible for you to come to the state of calmness, serenity, and self-surrender.
The mind in its foolishness thinks that it is working in this body. Why should I be bound by one system of nerves, and put the Ego only in one body, if the mind is omnipresent? There is no reason why I should.[Source]
The root of that degeneration is egotism - to think that one is just as great as any other, indeed!
Nature, body, mind go to death, not we. We neither go nor come. The man Vivekananda is in nature, is born and dies. But the Self we see as Vivekananda is never born and never dies. It is the eternal and unchangeable Reality.