That beast of the Apocalypse, to whom is given a mouth speaking blasphemies, and to make war with the saints, is sitting on the throne of Peter, like a lion ready for his prey.
Bestia illa de Apocalypsi, cui datum est os loquens blasphemias, et bellum gerere cum sanctis (Apoc. XIII, 5-7), Petri cathedram occupat, tanquam leo paratus ad praedam.
Original text (Latin)
Notes from Wikiquote
"That beast" to which Bernard refers is antipope Peter Leonis.