Do You Follow Your Heart? Head? Intuition?

A friend of mine is asking for advice. He’s in his 20’s. He’s struggling to define what’s next, not sure whether he’s already there or even where there might be. He’s going through the kind of thing that any thoughtful person seems to go through. Specifically, he's debating about whether to pursue an MBA or not, but as with any of these big life decisions, the specific decision hinges on so many other decisions, all feeding into the question about what kind of life one wants to live.

For me, a big part of what is meant by integrity is an alignment of head, heart, and gut. (And in matters of romance, I think it's important to add in a fourth organ.) I feel best when reason, emotion, and intuition all conspire to assure me that I'm in the right place, doing the right thing.

But here’s what I’m wondering. Which is the best leader? What have you relied on at different times in life? Have you plunged into life head first? Heart first? Or have you been led by your gut, that sense of intuition that you can’t articulate? How has it worked out? Does it depend on the situation? What do you think is best to follow?

Thoughts? [At this point, it'd be customary to express yourself in the comments section. Thanks!]