The "parable of the vineyard" assures us that God rewards us regardless of our hard work and investment, but only if we're called, only if God chooses us.

葡萄园的寓言“使我们确信,无论我们是否努力工作都会得到上帝的奖励，但除非上帝选择了我们。

耶鲁公开课 - 弥尔顿课程节选