How do we know that God's command to believe in Christ is true?

The truth of God's command to believe in Christ is grounded in the authority of Scripture. The consistent message from Genesis to Revelation is that salvation comes by faith in Jesus Christ. John reminds us in John 3:36 that belief in the Son leads to everlasting life, while unbelief results in condemnation. The inner witness of the Holy Spirit also confirms this truth, as those who believe are enabled to recognize Christ’s truth and have their hearts transformed. Thus, Scripture and personal experience validate the command to believe.