A marine biologist was swimming near the Cook Islands in the South Pacific when a 50,000-pound humpback whale suddenly appeared and tucked her under its fin. The woman thought her life was over. But after swimming slowly in circles, the whale let her go. It’s then that the biologist saw a tiger shark leaving the area. The woman believes the whale had been protecting her—keeping her from danger.

In a world of danger, we’re called to watch out for others. But you might ask yourself, Should I really be expected to be responsible for someone else? Or in Cain’s words: “Am…