@MK2boogaloo I would say that it is only demonstrated in such cases.

You can have principles, but no one knows it, not even yourself, until they are tested.

Hardship does not generate a noble spirit, but it does test its mettle and refine it.

Loyalty is one such concept that you don't know anyone has until it is put to the test.
"A friend in need is a friend indeed", but you won't know until you are "in need".