For example, consider someone who has a meaningful career that requires him to work on Shabbat. Love of God means that if your career does not align with what God wants, then you're resigned to give it up. Not because you agree to suffer, but because it's no longer your desire. You've reached the level where your will, and the will of God, become one.
What is loving God "with all your soul?" That's using all your energy and talents to serve God. Even if it involves pain or humiliation. And even if it means going so far as to give up your life. LINK
Read: Edna St. Vincent Millay (1892–1950). Renascence