Not with eyeservice, as menpleasers; but as the servants of Christ, doing the will of God from the heart. Ephesians 6:6. OHC 140.1
The law of Jehovah is exceedingly broad. Jesus ... plainly declared to His disciples that this holy law of God may be violated in even the thoughts and feelings and desires, as well as in the word and deed. The heart that loves God supremely will not in any way be inclined to narrow down His precepts to the very smallest possible claims, but the obedient, loyal soul will cheerfully render full spiritual obedience when the law is seen in its spiritual power. Then will the commandments come home to the soul in their real force. Sin will appear exceedingly sinful.... There is no longer self-righteousness, self-esteem, self-honor. Self-security is gone. Deep conviction of sin and self-loathing is the result, and the soul in its desperate sense of peril lays hold on the blood of the Lamb of God as his only remedy.... OHC 140.2
Many are deceiving their own souls today. They restrict the injunctions of God to condemn outward acts alone, and do not consider it sin to dishonor God in thoughts and affections. They flatter themselves that they are keeping the law of Jehovah while their life and character as daguerreotyped [photographed] in the books of heaven reveal them as venturing to see how far they can go in the direction of wrongdoing without being branded as transgressors of God's law.... OHC 140.3
Every soul who desires to depart from all iniquity ... will be ever laboring to be on the Lord's side in thought, in word, and in character, obedient to all His requirements. In the place of seeking opportunities to evade the law of God, he will give the largest interpretation to His far-reaching commandments and will strive most earnestly to bring the will, the affections, and all the heart to exemplify the great principles of His holy commandments.... The work must begin at the heart.... If the heart is right with God, then the whole life will be purified, refined, ennobled, sanctified. If the eye is single the whole body is filled with light. Religion is not a matter of externalities.... Religion is a thing of the heart.30Letter 51, 1888. OHC 140.4