How does Les handle the apparent contradiction between 'Christ died for every man' and 'chosen before the foundation of the world'?

Les teaches that Scripture clearly says Christ died for every man, tasted death for every man, and God is not willing that any should perish, yet it also says believers were chosen before the foundation of the world. He says he cannot explain those two facts of Scripture, but he will let them sit in Scripture by faith and let God settle the controversy. He illustrates this with the river of humanity flowing since Adam, lined along its banks with doors of opportunity marked 'Whosoever will may come.' When a person goes through that door, he looks back and sees on the other side, 'Chosen in Him before the world was ever created.' Les concludes that we must decide for ourselves, and yet the moment we decide, God says, 'I chose you.'