Why do preachers emphasize the need for God's Word in evangelism?

As noted in the sermon, the instructions given to the disciples regarding the colt underscore the importance of proclaiming God's Word faithfully. When the disciples were told to respond with, 'The Lord hath need of him,' the power of the Lord's Word was evident as it produced obedience from the colt's owners. This emphasizes that God’s Word is not merely informational but transformative, as it calls the elect to faith. Evangelism, therefore, relies on the faithful preaching of the gospel, knowing that God's Spirit works through His Word to save His chosen people. Just as God orchestrated the circumstances for the colt, He uses His Word to bring about the salvation of His people.