One cannot make a slave of a free person, for a free person is free even in a prison.
The race of the guardians must be kept pure.
The most important part of education is proper training in the nursery.
... for this discovery of yours will create forgetfulness in the learners' souls, because they will not use their memories; they will trust to the external written characters and not remember of themselves.
The wisdom of men is worth little or nothing.
Mariner, do not ask whose tomb this may be, but go with good fortune: I wish you a kinder sea.