The command sounds simple, but it requires from us a second simplicity, a simplicity that incorporates a good deal of complexity. To love God intellectually is to become a student of God-a student who really takes an interest in God. Some of them are ministers. These are people who don't ask about God, don't talk about God, and maybe don't even think about God unless they really have to. Their interest in God seems merely professional.
Lovers get preoccupied with their beloved, they notice things about the one they love.
The Scriptures give us a portrait of God we would never have guessed. Sometimes the portrait makes us squirm. To love God with all one's mind means taking an interest in God and in the peculiarities of God. This is mere courtesy toward God, and you cannot have love without it. The idea is that God gets to write his own autobiography.