Pagan duty of hospitality

This was a long time coming. I got some great artists to contribute and I think their art really brings the myths alive. In traditions around the world we see the same mythological trope of a god disguised as a beggar so that he can test mortals. Very often this is based on a moral that one should uphold the ancient tradition of honouring the guest in one's home. The myths usually show the god, who can be Zeus, Shiva, or Odin, punishing the mortals who fail to show them proper hospitality when they visit. What lessons can pagans learn from these myths?