Ephesians 1:4 says “For He chose us in Him before the creation of the world to be holy and blameless in His sight.”
This is not so much about the pros and cons of predestination, but rather rejoicing in the fact that God DID choose us before He even created our world. He also had the plan of salvation ready. He knew that, once He gave us the freedom to choose, we would choose to go our own way. Any one of us, through the centuries, would have made the same choice as Eve.
But when we choose to accept what Jesus has done for us – purchasing our redemption by His own blood – we then stand holy and blameless before God, No wonder Paul gets so excited here!