Mantra
The David Lynch Dune film includes a scene in which Piter De Vries recites the following upon drinking sapho juice:
It is by will alone I set my mind in motion. It is by the juice of sapho that thoughts acquire speed, the lips acquire stains, the stains become a warning. It is by will alone I set my mind in motion.This mantra is a creation of Lynch and does not appear in the books, though in Dune there is mention that Thufir Hawat has cranberry-stained lips from sapho juice.
The same mantra is also recited by the Harkonnen Mentat Hayt in the beginning of the House's campaign in the Dune 2000 (1998) video game before briefing the player on the first mission.
Read more about this topic: Mentat