Premanand Maharaj Ji

How can I know whether what I am doing is right or wrong?

Listen to the inner voice

When you are about to do wrong, a voice and a slight burning arise within, and that is Bhagwan's voice. Obey it and you will not err.

When you want to do wrong, a voice rises within you saying you are doing wrong. That is Bhagwan's, and it comes in everyone.