How do we know God's elect are truly His sheep?

One of the fundamental aspects of sovereign grace theology is the belief that God's elect, referred to as His sheep, will inevitably come to faith in Christ. This belief is grounded in the understanding that salvation is a work of grace, predestined by God before the foundation of the world. As expressed in the sermon, this believing is not what turns them into sheep, but rather, it evidences their identity as already chosen sheep. The gospel’s call is effective for the elect, as they respond to it by faith, which itself is a gift from God. Thus, the assurance of belonging to the fold of Christ is strongly tied to this divine initiative and calling.