Seems to me that swinging from heart (focus on emotions) to mind (reliance on thought, doctrine, theology) to navigate our relationship with God can be moving from one extreme to another. Emotions are not bad - they are apart of us and a necessary part of healthy relationships.
I tend to believe that Mind + Heart + Prayer determines a balanced Will. Here is an example: when I am visited by elders from the LDS church, I am often asked if I have read the Book of Mormon, after responding ‘yes’ (although, it has been about twenty years, at this point), they usually become interested to know how I ‘felt’ about it. It is an interesting question to ask because it seems irrelevant....after all, why does it matter how I might feel about information in a book? Wouldn’t it be more important to engage in a dialogue regarding the book’s historical accuracy or a comparison it may or may not have with scripture? No. In every case, the elders are primarily interested in whether or not, I received a ‘burning in the bosom’; did I, in fact, receive a feeling from God that the book was true, regardless of whether the the book was indeed, true!
My response to their inquiry is always, “yes. I did receive a burning in the bosom that the Book of Mormon is true, unfortunately, my mind was not in agreement with my heart. At a young age, I made a decision with myself that my mind and heart had to be in agreement before I allowed my will to act”. Later, after I met Christ, prayer was included in my decision making process.
My point is, simply replacing emotion with thought is not a safeguard against heresy or living out a unbalanced relationship with Christ. In fact, it opens up new pitfalls like legalism and an over reliance on doctrine at the expense of loving others.