Don’t talk Latin before the Franciscans, [23]
Don’t teach fishes to swim, [23]
Don’t throw away your dirty water till you have got clean, [160]
Don’t throw away your old shoes till you have got new ones, [318]
Don’t throw the handle after the bill, [333]
Don’t yoke the plough before the horses, [333]
Do what I say well, and not what I do ill, [224]
Do what the friar says, and not what he does, [224]
Do what thou doest (Age quod agis), [170]