C.H. Spurgeon emphasizes the importance of discerning truth from error in a world where eloquence often overshadows sound doctrine. He laments the tendency of people to follow charismatic speakers regardless of their teachings, urging believers to maintain a firm grasp on the truth of God's Word. Spurgeon calls for a community of believers who are rooted in Christ and able to distinguish between the doctrines of men and the teachings of the Lord. He warns against both bigotry and complacency, advocating for a strong, informed faith that binds believers to God. Ultimately, he desires to see a congregation that knows the truth and stands firm in it.

Horatius Bonar emphasizes God's divine jealousy for the truth, asserting that His eyes are constantly watching over it to guard and maintain it. He explains that there is only one standard of truth, which is definite, universal, and found in the Bible, and that God holds humanity accountable to this standard. Bonar warns against the laxity of thought in contemporary society, urging individuals to believe in the truth rather than speculate. He calls for a commitment to truthfulness in thought and action, reminding listeners that the day will come when truth will be exalted and error will be condemned. Ultimately, Bonar encourages everyone to align their beliefs with God's unwavering standard of truth.

John Gill emphasizes the importance of knowing the truth in his sermon on 1 John 2:21, addressing the potential confusion among believers regarding the necessity of his writing. He clarifies that he writes not to those who are ignorant, but to those who already possess knowledge of the truth, which comes from God, Christ, the Spirit, and the Scriptures. Gill warns against the deceivers and heresies that contradict the Gospel, reminding the congregation that no lie can originate from the truth. His message serves to reinforce the believers' understanding and defense of their faith against false teachings.