I feel that the essence of spiritual practice is your attitude toward others. When you have a pure, sincere motivation, then you have right attitude toward others based on kindness, compassion, love and respect.
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.