This quote is referring to the fact that when you are in love, it can profoundly transform who you are and bring out traits in you that you may have not even known you had. Love can make you feel more confident and courageous, and courage to face the world, to take risks and show more of who you really are. Therefore, this quote is saying that when you fall in love, it can make you feel so strongly that it brings out your innermost parts of your soul that you may have been keeping hidden away.