Matthew Poole and continuators on Romans 9:11

11. (For the children being not yet born, neither having done any good or evil , that the purpose of God according to election might stand , not of works , but of him that calleth) .

q. d. As there was nothing in the Birth of those Twins, so neither in their Works, that occasioned the Difference that God made bewixt them; For when God spake of what should happen to them, they were Unborn, and had done neither Good nor Evil.

He means, Actual good or evil; such as might Difference them one from another. As for Original Sin, they were both alike tainted therewith.

This Purpose of God is to be understood about Reprobation, or (if you will) Rejection, or Praeterition, as well as about Election.

Be Firm or Stable.

Either done or foreseen.

i. e. Of the good Pleasure and undeserved Favour of God, who also effectually Calleth those that He Hath Elected, as chap. 8.30. See a Parallel place, 2 Tim. 1.9.