When asked what was the greatest commandment, Jesus said in Matthew 22:27, "You shall love the Lord your God with all your heart, with all your soul, and with all your mind."
In discussing our love for Him, Jesus listed the heart before soul, mind, or strength. And heart-felt love is always mentioned first in parallel passages. Click on the following verses to see for yourself.
We are to love God with our entire being, but it is significant that scritpure always lists the heart first. Yes we are to love God totally with our thoughts and efforts but it begins with heart-felt passion.