WARNING: Long discussion - skip over it if you aren't interested because it has no practical effect on Salvation.
This is an idea that has brought forth much discussion and debate for centuries. I did a little research and found an interesting explanation for consideration in the Albert Barnes Commentary. It discusses the first part of Romans 8:29-30.
Rom 8:29 For those whom he foreknew he also predestined to be conformed to the image of his Son, in order that he might be the firstborn among many brothers.
Rom 8:30 And those whom he predestined he also called, and those whom he called he also justified, and those whom he justified he also glorified.
Here is an excerpt from Barnes' Commentary:
For whom he did foreknow - The word used here προέγνω proegnō has been the subject of almost endless disputes in regard to its meaning in this place. The literal meaning of the word cannot be a matter of dispute. It denotes properly to “know beforehand;” to be acquainted with future events. But whether it means here simply to know that certain persons would become Christians; or to ordain, and constitute them to be Christians, and to be saved, has been a subject of almost endless discussion. Without entering at large into an investigation of the word, perhaps the following remarks may throw light on it.
(1) It does not here have reference to all the human family; for all are not, and have not, been conformed to the image of his Son. It has reference therefore only to those who would become Christians, and be saved.
(2) It implies “certain knowledge.” It was certainly foreseen, in some way, that they would believe, and be saved. There is nothing, therefore, in regard to them that is contingent, or subject to doubt in the divine Mind, since it was certainly foreknown.
(3) The event which was thus foreknown must have been, for some cause, certain and fixed; since an uncertain event could not be possibly foreknown. To talk of a foreknowing a contingent event, that is, of foreknowing an event as certain which may or may not exist, is an absurdity.
(4) In what way such an event became certain is not determined by the use of this word. But it must have been somehow in connection with a divine appointment or arrangement, since in no other way can it be conceived to be certain. While the word used here, therefore, does not of necessity mean to decree, yet its use supposes that there was a purpose or plan; and the phrase is an explanation of what the apostle had just said, that it was “according to the purpose of God” that they were called. This passage does not affirm why, or how, or, “on what grounds” God foreknew that some of the human family would be saved. It simply affirms the fact; and the mode in which those who will believe were designated, must be determined from other sources. This passage simply teaches that he knew them; that his eye was fixed on them; that he regarded them as to be conformed to his Son; and that, thus knowing them, he designated them to eternal life. The Syriac renders it in accordance with this interpretation: “And from the beginning he knew them, and sealed them with the image of his Son,” etc. As, however, none would believe but by the influences of his Spirit, it follows that they were not foreknown on account of any faith which they would themselves exercise, or any goodworks which they would themselves perform, but according to the purpose or plan of God himself.
(PhredPhantom again)
So, while this commentary certainly does not settle the question, it provides a little more insight into the logic included in the Bible verse.
