"In practice people who study philosophy too long become very odd birds, not to say thoroughly vicious; while even those who are the best of them are reduced by. philosophy to complete uselessness as members of society."

"It is a common saying, and in everybody's mouth, that life is but a sojourn. The learning and knowledge that we have, is, at the most, but little compared with that of which we are ignorant."

"As it is, the lover of inquiry must follow his beloved wherever it may lead him."

"Complacent ignorance is the most lethal sickness of the soul."

"Think only of the ambition of men, and you will wonder at the senselessness of their ways, unless you consider how they are stirred by the love of an immortality of fame. They are ready to run all risks greater far than they would have run for their children, and to spend money and undergo any sort of toil, and even to die, for the sake of leaving behind them a name which shall be eternal."

"Let nobody speak mischief of anybody."

"For all good and evil, whether in the body or in human nature, originates in the soul, and overflows from thence, as from the head into the eyes."

"I used to imagine that no human can make men good; but I know better now."

"Lack of activity destroys the good condition of every human being."

"I exhort you also to take part in the great combat, which is the combat of life, and greater than every other earthly conflict."

"In order for man to succeed in life, God provided him with two means, education and physical activity. Not separately, one for the soul and the other for the body, but for the two together. With these means, man can attain perfection."

"The constrained performance of bodily labour does, it is true, exert no evil influence on the body; but in the case of the mind, no study, pursued under compulsion, remains rooted in the memory."