How do we know that we are called and chosen by God?

In the sermon, it is emphasized that a distinct mark of being called by God is the believer's response to the gospel, which creates a genuine faith in Christ. Jude mentions those who are 'called' as those whom God has effectually brought to faith by the power of the Spirit. If one possesses a desire for Christ and His righteousness, it is an indication of God's calling. The Bible provides assurance of this calling, as seen in Romans 1:16-17, indicating that the gospel is the power of God for salvation to everyone who believes.