What if God, desiring to show his wrath and to make known his power, has endured with much patience vessels of wrath prepared for destruction, in order to make known the riches of his glory for vessels of mercy, which he has prepared beforehand for glory-- even us whom he has called, not from the Jews only but also from the Gentiles?
~ Romans 9:22-24
What if those who weren't called were created so that those who were knew what it meant to not be called? Kind of like a pro-footballer who trains their entire lives to make the Cut for first-team selection, how can they appreciate making the team if they didn't have to beat three other players for their starting position. Would a footballer really respect their place in the squad if they just walked up and took their place? No. In fact, the opposite happens - those who are naturally gifted at sport when they are young don't need to work to make the first team, so when they reach the Pro's, they also think they just need to turn up and make it. They don't understand that at the top they actually need to work for it, and those who are most gifted are often those who fall hardest and never make it at all.