We must take care to live not merely a long life, but a full one; for living a long life requires only good fortune, but living a full life requires character. Long is the life that is fully lived; it is fulfilled only when the mind supplies its own good qualities and empowers itself from within.
Seneca the YoungerThe deep waters of time will flow over us: only a few men of genius will lift a head above the surface, and though doomed eventually to pass into the same silence, will fight against oblivion and for a long time hold their own.
Seneca the YoungerTo strive with an equal is dangerous; with a superior, mad; with an inferior, degrading.
Seneca the YoungerWhen some state or other offered Alexander a part of its territory and half of all its property he told them that 'he hadn't come to Asia with the intention of accepting whatever they cared to give him, but of letting them keep whatever he chose to leave them.' Philosophy, likewise, tells all other occupations: 'It's not my intention to accept whatever time is leftover from you; you shall have, instead, what I reject.' Give your whole mind to her.
Seneca the Younger