What does the Bible say about God's calling in Isaiah 51?

In Isaiah 51, God speaks tenderly to His people, urging them to hearken and trust in Him. He calls them not just to listen, but to obey, reassuring them of their identity as His people. God highlights Abraham as an example of one called out of darkness, illustrating how He calls His chosen ones to Himself, granting them faith and righteousness found only in Jesus Christ. The passage emphasizes that God's call is not based on human merit but rooted in His sovereign grace and purpose for salvation.