God called Joseph to a task he didn't understand and didn't want to do: take a pregnant young woman as his wife and adopt her child as his own, despite the misunderstandings and hit to his reputation this would cause. When God sends an angel to Joseph in a dream and explains the purpose to this call, he immediately obeys. Similarly, when God calls us to follow Him in one way or another, our call is to immediately obey, even when our sinful nature would rather not.