Scio Occultus Res
A rote is very refined, heavily-researched spell that has been perfected over time. It is a way of accomplishing a particular effect reliably and efficiently, without needing to improvise the magic. Mages tend to rely on rotes they have learned from their mentors and Orders, with a few mages going on to develop their own rotes.
While some rotes are essentially so well known as to be considered public domain, most rotes have been developed and perfected by the Orders, and they guard their magical secrets very closely. Knowing a rote for an Order one doesn’t belong to is dangerous; should the Order find out, they will exact a heavy price. Teaching a non-member a rote of your Order is also grounds for the strictest punishment.