When the head of a goat is severed from its body, the trunk struggles for some time, still showing signs of life. Similarly, though ahamkara (egotism) is slain in the perfect man, yet enough of its vitality is left to make him carry on the functions of physical life; but it is not sufficient to bind him again into the world.
These people are like ... a frog living in a well, who has never seen the outside world. He knows only his well, so he will not believe that there is such a thing as the world. Likewise, people talk so much about the world because they have not known the joy of God.
The sun can give heat and light to the whole world, but he cannot do so when the clouds shut out his rays. Similarly as long as egotism veils the heart, God cannot shine upon it.
The fool who repeats again and again: "I am bound, I am bound," remains in bondage. He who repeats day and night: "I am a sinner, I am a sinner," becomes a sinner indeed.
Wisdom leads to unity, but ignorance to separation.
So long as God seems to be outside and far away, there is ignorance.
But when God is realised within, that is true knowledge.
You speak of doing good to the world. Is the world such a small thing? And who are you, pray, to do good to the world? First realise God, see Him by means of spiritual discipline. If He imparts power you can do good to others; otherwise not.