It is sure the hardest science to forget!
From vulgar bounds with brave disorder part, And snatch a grace beyond the reach of art.
Mankind is unamendable.
Men must be taught as if you taught them not, and things unknown proposed as things forgot.
True disputants are like true sportsmen: their whole delight is in the pursuit.
All looks yellow to the jaundiced eye. [and therefore the solution is to fix the jaundiced eye.]