C.H. Spurgeon emphasizes the enduring nature of truth as expressed in Proverbs 12:19, contrasting it with the fleeting nature of falsehood. He encourages believers to remain steadfast in declaring God's truth, despite facing opposition, as ultimate victory belongs to truth. Spurgeon highlights that while lies may seem to triumph temporarily, they are ultimately transient and will perish. He calls on the heart to align with truth in all matters, especially in relation to Jesus, who embodies grace and truth. The sermon serves as a reminder of the power and permanence of God's truth in a world filled with deception.