How do we know if we are one of God's sheep?

In this sermon, it is emphasized that true believers, or God's sheep, will respond to the gospel and desire to be under its sound. This response can be seen in a longing for the Word of God and a continual calling upon the Lord for mercy. The genuine cries of a believer indicate the presence of the Holy Spirit at work within them, leading them to seek Christ and His nourishment. Ultimately, the assurance of being one of God's sheep is found in the active faith and reliance on Christ's redemptive work.