Occasionem cognosce—Know your opportunity.
Occasions do not make a man frail, but they show what he is. Thomas à Kempis.
Occidit miseros crambe repetita magistros—Cabbage repeated is the death of the wretched masters. Juv.
Occupation is the scythe of Time. Napoleon.
Occupet extremum scabies!—Murrain take the 50 hindmost! Hor.
Ocean is a mighty harmonist. Wordsworth.
Oculi tanquam speculatores altissimum locum obtinent—The eyes, like sentinels, occupy the highest place in the body. Cic.
Oculis magis habenda fides quam auribus—It is better to trust to our eyes than our ears.
Oculus domini saginat equum—The master's eye makes the horse fat. Pr.
Oderint dum metuant—Let them show hate, provided they fear. Cic.