The sad fact is that not everyone's mind will be stretched by new experience. Some can't. Some won't. Some actively block their experiences from getting beyond their skin.

Although we all know "that guy" who is still playing the high school football reviews in his head even though he's 40, I never saw this sad fact more clearly than when I first started traveling abroad for business . We'd come back and it was almost palpable the difference I saw between people who let their minds be stretched, and thus their horizons, and those who remained nearly exactly the same. A stamp in their passport and some photos in front of landmarks.