We are to love God with the totality of our being. It is very instructive to see how Mark's version differs from the original text. The heart was both the thinking and feeling organ of the body. But I like the idea that Jesus pointed out specifically that we are to love God with our minds. Like the scarecrow in the Wizard of Oz, some Christians need to go to God in search of a brain.
Some people are all emotion and no brain.
In the Wizard of Oz, the poor scarecrow has no brain, so he wants to meet the wizard and ask for one. Oh, I could tell you why The ocean's near the shore. I could think of things I never thunk before. If I only had a brain. I once heard a sermon that was well delivered but hardly made any sense at all.