To love God with all your soul
How can you do this if you don't know what your soul is?
Meditation is the way to know your Self as the soul. As you progress in meditation, you suddenly realize. "I am not this little body made of flesh. I am not all of these emotions and these habits. I am that something which is behind this flesh, which is behind these thoughts, which is surely directing the course of my life."
Gradually you see that you are the master of your own fate. You see you are that which is made in the image of the Divine-the soul of Self within you. And you feel a sense of expansion as your soul-awareness unfolds revealing itself as a part of the Infinite.