True love for Jesus involves the whole person. There is an unmistakable inclusion - if not emphasis - on loving God with our minds - with what we think, our values, our opinions, our reasoning, with our view of God and ourselves and the world. The real question is not, “Do we need sound doctrine?,” but rather, “Is the doctrine I have sound?”
The only way for us to know God is for Him to reveal Himself to us. The only place He does this in such a way that we can have a relationship with Him is in His Word.