Who keeps the old akindle and adds new knowledge is fitted to be a teacher.
The strongest memory is not as strong as the weakest ink.
To err and not reform, this may indeed be called error.
A good man will certainly also possess courage; but a brave man is not necessarily good.
It is when those who are not strong enough have made some moderate amount of progress that they fail and give up.
A fool marvels at rare things, but a wise man at common ones.