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.
The eyes of the LORD are in every place. His eyes are upon all men’s ways: they are not hid from His face, neither is their iniquity hid from His eyes.
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)?
