12 Then Isaac sowed in that land, and received in the same year an hundredfold: and the Lord blessed him.
13 And the man waxed great, and went forward, and grew until he became very great:
14 For he had possession of flocks, and possession of herds, and great store of servants: and the Philistines envied him.
I didn’t understand before I became a working man and had investments how significant a yearly increase a hundredfold is. In today’s terms, we would say that Isaac was making a 10,000% return on his investment! It’s frankly ridiculous, and of such a magnitude that one could not take the credit for it, but would have to admit they had been blessed by the hand of providence.
Thus, while Abraham had become rich and powerful, Isaac became even more so. Of course, all this wealth was for a purpose. If God intended to maintain a pattern of one covenant child per generation, then there would be no need to increase Isaac past his father. But the lineage was supposed to expand rapidly, and so the foundation to support it needed to as well.