It is imperative that men speak the truth, for “he that speaketh the truth sheweth forth righteousness,” and his lip “shall be established for ever.”
God has a calling on each man’s life. Furthermore, He enables men to fulfill their appointed work. Man, however, must be strong and DO the work.
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)?