How do we know God's record about Jesus is true?

The assurance of the truthfulness of God's record regarding His Son comes from the witness that the Holy Spirit provides to believers. 1 John 5:10 states, 'He that believeth on the Son of God hath the witness in himself.' This implies that through the indwelling of the Holy Spirit, believers are given the confidence to trust God's testimony about Jesus. The Spirit of God convinces our hearts and provides the understanding that the testimony of Christ is reliable and true. Additionally, in 1 John 2:20, we read, 'But ye have an unction from the Holy One, and ye know all things,' underscoring that the Holy Spirit instructs and affirms our knowledge of Christ's truth.