I'm somewhat ambivalent on the question of whether my liberal arts education actually made a difference in my life, but "because I heard it in psych class" would be at the very bottom of my reasons to believe so. If you're going to hold the opinion that a liberal education teaches you how to learn and informs all your future decision-making, hold it because experiences have corroborated that, not because you read in a psych textbook that that's how it's supposed to work. Textbooks do lie, y'know. ;-)

Otherwise - well, you haven't really learned how to learn, have you? If the point of a liberal education is to make sense of the world around you and form your own opinions, and you're still regurgitating things you read in a book, that liberal arts education has failed.

First of all, I was being a bit tongue-in-cheek.

However, yes I do take much of what I've learned at face value. After all, it would be foolish to take years of expert research and toss it out because I personally didn't conduct it. Unless it runs wildly counter to my personal experience, I have no real reason not to trust it as the best scientific explanation at a given time. Thankfully my personal experience most certainly corraborates it.

There is a world of difference between healthy skepticism (consistently questioning scientific theory through empirical observation) and doubting for doubting sake. I haven't personally verified that the earth orbits the sun, but I'm pretty sure we have that one right after all.