But if even after all this, virtue seem to thee an irksome thing, consider that vice is more irksome. And this very thing He was intimating, in that He said not first, “Take my yoke upon you,” but before that, “Come, ye that labor and are heavy laden;” implying that sin too hath labor, and a burden that is heavy and hard to bear. For He said not only, “Ye that labor,” but also, “that are heavy laden.” This the prophet too was speaking of, when in that description of her nature, “As an heavy burden they weighed heavy upon me.” And Zacharias too, describing her, saith she is “A talent of lead.”