How do we know the virgin birth of Jesus is true?

The virgin birth of Jesus is an essential doctrine in Christianity, affirmed in Matthew 1:23, which quotes Isaiah 7:14, stating, 'Behold, a virgin shall be with child, and shall bring forth a son.' This miraculous conception was crucial because it ensured that Jesus, being born of a virgin, was without original sin, thus able to live a perfect, sinless life. In the sermon, it was emphasized that 'the reason for the virgin birth of Jesus Christ is that the human nature that he assumed in the womb of the Virgin Mary was a true human nature, but it was holy.' Thus, the virgin birth underlines the unique nature of Jesus as both fully divine and fully human, fulfilling the requirements necessary for Him to serve as the Savior of His people.