Truth is a crucial piece in the believer’s armour, girding the loins and, as such, freeing a man from life's entanglements.
God wants believers to serve Him in truth. In fact, it is this very issue that will determine “of what sort” our work is at the judgment seat of Christ.
People's motives in serving Christ vary from pure to sinful. However, other men’s motives should not rob us of the joy of Jesus Christ being preached.