And think not to say within yourselves, We have Abraham as our father: for I say unto you, that God is able of these stones to raise up children unto Abraham.
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Theophylact of Ochrid
AD 1107
This was to their destruction, that they put their trust in their noble lineage.
The "stones" mean the Gentiles, many of whom believed; but John is also saying simply that God is able to make children for Abraham out of stones. For the womb of Sarah was a stone on account of her sterility, but she gave birth nevertheless (Gen. 18:11-12; 21:1-2). When also did the Lord raise up children unto Abraham from stones? At His crucifixion, when many believed upon seeing the stones which were sundered (Mt. 27:51).