Well, your mind needs training to get fit as well, because it is only the fit mind that can see and understand oneness.
If you desire a fit mind you must cease from doing the things that you're doing and that you yourself know is wrong. You cannot hate. You can't be greedy or lustfully. You must train your mind towards positive behaviour instead of negative behaviour. If you can do this you will come to realise what oneness is. Then oneness will teach you how to love your fellow beings. Otherwise you will remain in darkness living your life in total ignorance without any light. Never realising that God is right there in the dark with you, but you are too busy doing wrongs to notice.