The life of the dead consists in the recollection cherished of them by the living.

He has no worse enemy than himself.

Not to have knowledge of what happened before you were born is to be condemned to live as a child.

Every one is least known to himself, and it is very difficult for a man to know himself.

There is in fact a true law namely right reason, which is in accordance with nature, applies to all men and is unchangeable and eternal. ... It will not lay down one rule at Rome and another at Athens, nor will it be one rule today and another tomorrow. But there will be one law eternal and unchangeable binding all times and upon all peoples.

Exercise and temperance can preserve something of our early strength even in old age.

Knowledge which is divorced from justice, may be called cunning rather than wisdom.