A hands-on experience.

It's not a remarkable picture, and of no one in particular, just
one of those random faces I like to draw. But I discovered
something interesting after I'd finished. The face tells a sad
little story. If you hold your hand over the right side of the face,
you'll see that on the left is a young face, full of sorrow. And when
you cover the left side, the right is an older face, hardened with bitterness.

I think the story is that within a person who may seem sour or cynical,
there may be a history of some sadness or despair that is still carried
with them every day.

The moral: Judge not. We do it all the time, and we do not have
the right qualifications.