God has predestined the Elect from before the foundation of the world. But the Elect, except by a direct revelation from heaven, can never know if they are truly among the Elect. No one knows what tomorrow brings. The holiest of men have been seen to fall away, and the wickedest of men have been seen to embrace their cross. God knows. We do not. I honestly believe that we deceive ourselves if we think we do know. Jesus said that the one who persevered to the end would be saved. Let us all pray, then, for the grace to persevere.