"Why are you crying?" he asked his mom.
"Because I'm a mother," she told him.
"I don't understand," he said.
His mom just hugged him and said, "You never will!"
Later the little boy asked his father why Mother seemed to cry for no
reason.
"All mothers cry for no reason," was all his dad could say.

The little boy grew up and became a man, still wondering why
mothers cry.
So he finally put in a call to God, and when God got on the phone the
man said, "God, why do mothers cry so easily?"

God said, "You see son, when I made mothers they had to be special.
I made their shoulders strong enough to carry the weight of the world, yet gentle enough to give comfort.
I gave them an inner strength to endure childbirth and the rejection
that many times come from their children."
"I gave them a hardiness that allows them to keep going when
everyone else gives up, and to take care of their families through sickness and fatigue without complaining."
"I gave them the sensitivity to love their children under all
circumstances, even when their child has hurt them very badly. This same sensitivity helps them to make a child's boo-boo feel better and helps them share a teenager's anxieties and fears."
"I gave them a tear to shed. It's theirs exclusively to use whenever it's needed.
It's their only weakness. It's a tear for mankind."