How do we know the doctrine of being born twice is true?

In John 3, our Lord Jesus states, 'Except a man be born again, he cannot see the kingdom of God.' This pivotal teaching illustrates the necessity of a spiritual birth, distinct from our physical birth, for true salvation. Believers are born again by the Spirit, receiving new life that enables them to understand and embrace spiritual truths. This is foundational in sovereign grace theology, which emphasizes God's initiative in salvation, as He quickens the soul through His Word and the work of the Holy Spirit. Each believer's transformation is a testament to the reality of being born twice.