Such a positively strong way of saying - love God with everything you are.
Our spiritual lives get complicated when it is only part of who we are - and only part of what we do.
Whenever I hike in Yosemite (which usually involves an altitude change of 3-4,000ft) I always say, I either have to do this less, or I need to do these hikes more. Meaning I'm not really strong enough, or have the endurance to do it today. But I know if I did it more often, I'd get stronger.
So next time church is boring, or the Bible doesn't make sense to your life . . . try living, and loving God, with all your heart, and with all your soul, and with all your mind.