Ignorance, the root and the stem of every evil.
It behooves those who take the young to task to leave them room for excuse, lest they drive them to be hardened by too much rebuke.
We are bound to our bodies like an oyster to its shell.
Books are immortal sons deifying their sires.
Let no-one ignorant of geometry enter. Said to have been inscribed above the door of Plato's Academy.
Better a little which is well done, than a great deal imperfectly.