In loving God with all our being (and doing) we need to keep working hard on our thinking. I like what N.T. Wright said, something to the effect, "I want to know what you are thinking, not how you are feeling."
Oftentimes in my own darkness, I've been helped into light through thinking about truth. Of course it is the truth in Jesus that sets us free, and it begins in the mind, but is to change our hearts and be worked out in all of life.
This does not deny the need for a simple childlike faith, which doesn't insist on understanding everything, but simply trusts God and his word. But we must not underestimate the importance of words and the meaning behind them, especially we who are people of the Book, though really being people of the Spirit and the word/Book.
But above all, we need to love. Love helps us know as we really need to, and to know as God intends us to. In a relational manner, and not in an abstract and therefore lifeless way.
What comes to your mind that you'd like to share from these thoughts on thinking?