How do we know the call of grace is for everyone?

In Isaiah 56, the Lord explicitly proclaims that His call of grace is not limited to the Jews; it also includes Gentiles. This is significant because it demonstrates God's desire to gather a people from all nations who are thirsty for Him. The text asserts that those who are considered strangers or outcasts are invited to take hold of the covenant, emphasizing God's inclusive offer of grace. Moreover, Jesus reiterated this promise in John 10, declaring that He has other sheep not of this fold, emphasizing the open invitation to all who hear His voice and respond in faith.