Comes from Eric Young and is an excerpt from R.C. Sproul, asking a question that I think advocates of free will cannot answer. The post is titled R.C. Sproul On The Serious Answer All Arminians Must Answer:
The biggest question any semi-Pelagian or Arminian has to face at the practical level is this: Why did I choose to believe the gospel and commit my life to Christ when my neighbor, who heard the same gospel, chose to reject it?
That really gets to the crux of it. So many people hear the Gospel, often at the same time and from the same person but only some respond. Why? That is the question that can only be satisfactorily answered by the submission to the sovereign grace of God in salvation. Good stuff and humbling.