Let no-one ignorant of geometry enter. Said to have been inscribed above the door of Plato's Academy.

To suffer the penalty of too much haste, which is too little speed.

And we shall most likely be defeated, and you will most likely be victors in the contest, if you learn so to order your lives as not to abuse or waste the reputation of your ancestors, knowing that to a man who has any self-respect, nothing is more dishonourable than to be honoured, not for his own sake, but on account of the reputation of his ancestors.

Take charge of your thoughts. You can do what you will with them

Seek truth while you are young, for if you do not, it will later escape your grasp

Of all the things which a man has, next to the gods his soul is the most divine and most truly his own.

Few men are so obstinate in their atheism, that a pressing danger will not compel them to acknowledgment of a divine power.