1 Thessalonians 2:3-5

3For our exhortation is not of error, nor of uncleanness, nor in guile:

4but even as we have been approved of God to be intrusted with the gospel, so we speak; not as pleasing men, but God which proveth our hearts.

5For neither at any time were we found using words of flattery, as ye know, nor a cloke of covetousness, God is witness;