2 Corinthians 9:7 - So let each one give as he purposes in his heart, not grudgingly or of necessity; for God loves a cheerful giver.
Ephesians 6:5 - Bondservants, be obedient to those who are your masters according to the flesh, with fear and trembling, in sincerity of heart, as to Christ; 6 not with eyeservice, as men-pleasers, but as bondservants of Christ, doing the will of God from the heart.
1 Thessalonians 2:3 - For our exhortation did not come from error or uncleanness, nor was it in deceit. 4 But as we have been approved by God to be entrusted with the gospel, even so we speak, not as pleasing men, but God who tests our hearts.
1 Timothy 1:5 - Now the purpose of the commandment is love from a pure heart, from a good conscience, and from sincere faith.