We know this story, but it is worth recollecting again.
There was a wise woman traveling in the mountains. She found a precious stone. The following day she met another traveller who was hungry, and the wise woman opened her bag to share her food. The hungry traveller saw the precious stone at that time, and asked the lady for it.
She handed the precious stone over with zero hesitation. The traveller left, happy like never before. He thought he was now set for life.
But he came back shortly thereafter, to return the stone to the wise lady.
Why? Because he told her he wanted something even more precious than the precious stone. What could that be?
Only the ability and attitude to be able to give away something so precious in the first place.