Laertius on Epicurus

“We cannot quote from his own works, in his own words, because, although he wrote very much, only a summary of his writings has come to us uninjured; but his doctrines have been so fully investigated and treated on, both by his opponents and his disciples, that there is no difficulty or doubt as to the principles inculcated in the school of Epicurus....”

“The sum of his doctrine concerning philosophy, in general, is this: Philosophy is the exercise of reason in the pursuit and attainment of a happy life; whence it follows, that those studies which conduce neither to the acquisition nor the enjoyment of happiness are to be dismissed as of no value. The end of all speculation ought to be, to enable men to judge with certainty what is to be chosen, and what to be avoided, to preserve themselves free from pain, and to secure health of body, and tranquillity of mind. True philosophy is so useful to every man, that the young should apply to it without delay, and the old should never be weary of the pursuit; for no man is either too young or too old to correct and improve his mind, and to study the art of happiness. Happy are they who possess by nature a free and vigorous intellect, and who are born in a country where they can prosecute their inquiries without restraint: for it is philosophy alone which raises a man above vain fears and base passions, and gives him the perfect command of himself.”

“As nothing ought to be dearer to a philosopher than truth, he should, pursue it by the most direct means, devising no actions himself, nor suffering himself to be imposed upon by the fictions of others, neither poets, orators, nor logicians, making no other use of the rules of rhetoric or grammar, than to enable him to speak or write with accuracy and perspicuity, and always preferring a plain and simple to an ornamented style. Whilst some doubt of everything, and others profess to acknowledge everything, a wise man will embrace such tenets, and only such as are built upon experience, or upon certain and indisputable axioms.”