Genesis 37:28

28.Then there passed by Midianites. Some think that Joseph was twice sold in the same place. For it is certain, since Median was the son of Abraham and Keturah, that his sons were distinct from the sons of Ishmael: and Moses has not thoughtlessly put down these different names. (135) But I thus interpret the passage: that Joseph was exposed for sale to any one who chose, and seeing the purchase of him was declined by the Midianites, he was sold to the Ishmaelites. Moreover, though they might justly suspect the sellers of having stolen him, yet the desire of gain prevents them from making inquiry. We may also add, what is probable, that, on the journey, they inquired who Joseph was. But they did not set such a value on their common origin as to prevent them from eagerly making gain. This passage, however, teaches us how far the sons of Abraham, after the flesh, were preferred to the elect offspring, in which, nevertheless, the hope of the future Church was included. We see that, of the two sons of Abraham, a posterity so great was propagated, that from both proceeded merchants in various places: while that part of his seed which the Lord had chosen to himself was yet small. But so the children of this world, like premature fruit, quickly arrive at the greatest wealth and at the summit of happiness; whereas the Church, slowly creeping through the greatest difficulties, scarcely attains, during a long period, to the condition of mediocrity.