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.
RamakrishnaPray to God that your attachment to such transitory things as wealth, name, and creature comforts may become less and less every day.
Ramakrishna