Bible Verses About Sincerity: The preaching of the gospel

For we are not as so many, peddling the word of God. But as of sincerity, but as of God, in the sight of God, we speak in Messiah.

For our exhortation is not of error, nor of uncleanness, nor in deception.

But even as we have been approved by God to be entrusted with the Good News, so we speak; not as pleasing men, but God, who tests our hearts.

For neither were we at any time found using words of flattery, as you know, nor a cloak of covetousness (God is witness),