Onus probandi—The burden of proving. 25
Onus segni impone asello—Lay the burden on the lazy ass. Pr.
Open not your door when the devil knocks. Pr.
Open rebuke is better than secret love. Pr.
Opera illius mea sunt—His works are mine. M.
Operæ pretium est—'Tis worth while; worth 30 attending to.
Opere in longo fas est obrepere somnum—In a long work sleep must steal upon us. Hor.
Operosa parvus carmina fingo—I, a little one, compose laborious songs. Hor.
Operose nihil agunt—They toil at doing nothing. Sen.
Opes regum, corda subditorum—The wealth of kings is in the affections of their subjects. M.