God is "a God of truth" and the words that proceed forth from Him reflect His nature. As such, the words of God are just as true as the God of the words.
Sin and those who participate therein anger Lord. In the days of Noah, sin grieved the Lord so badly that it repented God that he had made man on the earth.
How would making your motive match the Lord's motive change how you approach the Christian life (from witnessing to praying to Bible reading and so on)?