Truthful means honesty. You cannot trust others when you're not truthful to yourself. Way Of life involve truthfulness. Be honest to your service to humanity. Be truthful and you shall receive the blessing attache to it.
A driver driving his boss for over 8years. He work diligently and he was truthful to his work and to his boss, suddenly the boss sick and die after that the wife of his boss looking for truthful man so that she can remarry eventually she married the driver. The driver share his testimony says when his working for his boss not knowing that his boss working for him. Is good to be truthful in all areas of our lives.