NaruNaruChan... glad you're feeling better! It can be a hard transition to let go of everything that was pounded into you.
Double Edge... actually, Columbus based his conclusion on astronomical data and detailed research. So you could equally well say that he followed his head.
Seriously, I think that 'follow your heart' and 'follow your head' really mean the same thing: trust yourself, and do what makes sense to you.
Bradley, after all, is following his heart by being a materialistic rationalist.