Your mind understands what it has been taught; your heart, what's true.
While I don't give one iota credence to the claim, and even disregarding the heart "understands" anything argument, I do think the above is a common belief of many people. Assuming the heart can actually do more than pump blood, using it as a symbol for our feelings, which is how I understand the pseudowisdom above, then the fortune (and by extension the people who believe such nonsense) exalts "feelings" above "knowledge."
If a creationist were to subscribe to this belief, it would certainly explain the behavior of the fundies. Perhaps, the above premise may even be said to supersede the premise, "god exists," since many religionists will cite they "feel" god's presence.
And further,"Your mind understands what it has been taught," implies by omission, that what you know, has all been taught to you. It excludes that our minds can make their own firsthand discoveries and even confirm what we were taught.
I'm not making a mountain out of a fortune cookie here, rather pointing out that I think there are a lot of people (few members here, I imagine) who are in full agreement with what the fortune cookie said.