This phrase appears in mundakopanishad which means "truth alone triumphs" ... I know I know what you are whispering..... All these years I remained loyal to my boss see, what I am today?
At least, being truthful has a valid point in a criminal syndicate. They follow truthfulness at least, among themselves. In their "trade" nothing appears on paper. Everything is followed orally. The slightest ray of suspicion invites the word "khallas" from the boss.
Hence, everybody loves being truthful but, only change we expect others to follow it is not for us.