Why is preaching the Gospel important for spiritual understanding?

The preaching of the Gospel plays a crucial role in initiating spiritual understanding. As John Newton argues, the Gospel serves as an instrument through which the Holy Spirit can perform the work of regeneration and enlightenment (Romans 10:14). Although the power of human speakers may vary, it is not their eloquence that matters but the divine promise accompanying their message. Effective preaching depends on the Spirit's work; without it, even the most skillful orator may labor in vain. This reliance underscores the importance placed on the church's proclamation of the Gospel, which is designed to illuminate the truth of Christ and his salvation for all who believe.