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.
A martyr is one who is killed for his faith. Only two individuals are specifically named as martyrs in scripture: Stephen and Antipas.