How do we know that God has not cast away His people?

In Romans 11:2, Paul states that God has not cast away His people whom He foreknew. This foreknowledge reveals a special, loving relationship that distinguishes those who are redeemed from the remainder of Israel. Paul uses the example of Elijah, who thought he was the last faithful one, yet God informed him of the 7,000 who had not bowed to Baal. This demonstrates that even when it seems like true faith is scarce, God always preserves a remnant according to His sovereign grace. Thus, His determination to save is rooted in His eternal purpose, ensuring that all those He has called will ultimately be saved.