the source of true joy

A brief followup to yesterday’s post on singer Susan Boyle:

Real joy comes not from ease or riches or from the praise of men, but from doing something worthwhile.

— W.T. Grenfell

A sidenote of interest: while searching for a photo that would capture what I wanted to convey about true joy, almost all of the images I came across showed people with their arms raised upward. Something about true joy seems to cause an upward thrust of our body — and, I would say, spirit as well. Why is that? What is this seemingly universal gesture of reaching upwards and out to express joy? What are we reaching for?