How do we know that true simplicity leads to sincerity?

The connection between simplicity and sincerity is evident in the believer's heart that genuinely loves and serves God above all else. When our primary aim is to glorify God, our actions reflect that singular devotion, resulting in honesty and integrity. According to John Newton, those who are grounded in the simplicity of faith will demonstrate sincerity in both public and private spheres. This consistency validates their faith and provides assurance that they are living according to God's will, free from the temptation of duplicity that pervades the world.