From Jhumpa Lahiri's "Hell-Heaven," a short story in Dave Egger's "Best Amercan Non-required Reading":

But back then, he also confessed, he was so new to America that he took nothing for granted and doubted even the obvious.

A lot of times when I'm dumb or slow or naïve, it's just that I'm doubting the obvious. I'm still a newb in the world.