The soul in which philosophy dwells should by its health make even the body healthy. It should make its tranquillity and gladness shine out from within; should form in its own mold the outward demeanor, and consequently arm it with a graceful pride, an active and joyous bearing, and a contented and good-natured countenance. The surest sign of wisdom is constant cheerfulness.

Philosophy can make people sick.

You may think that you are well, but you will not secure health until you think thoughts that produce health. You may persistently affirm that you are well, but so long as you live in discord, confusion, worry, fear and other wrong states of mind, you will be sick; that is, you will be as you think and not what you think you are. You may state health in your thought, but if you give worry, fear and discord to that thought, your thinking will produce discord. It is not what we state in our thoughts, but what we give to our thoughts that determine results.

To think is to be sick.

The disease of philosophy. - Philosophy is itself the disease for which it pretends to be the cure: the wise man does not pursue wisdom but lives his life, and therein precisely does his wisdom lie.

To think is to be sick...

The old Romans had a custom which survived even into my lifetime. They would add to the opening words of a letter: "If you are well, it is well; I also am well." Persons like ourselves would do well to say. "If you are studying philosophy, it is well." For this is just what "being well" means. Without philosophy the mind is sickly.

True philosophy is a living wisdom, for which there is no death.

The philosopher treats a question; like an illness.

Do not trouble about those who practice philosophy, whether they are good or bad; but examine the thing itself well and carefully. And if philosophy appears a bad thing to you, turn every man from it, not only your sons; but if it appears to you such as I think it to be, take courage, pursue it, and practice it, as the saying is, 'both you and your house.

What's the good of a philosophy with a major premise that isn't the rationalization of your feelings? If you've never had a religious experience, it's folly to believe in God. You might as well believe in the excellence of oysters, when you can't eat them without being sick.

Someone who has thought rationally and deeply about how the body works is likely to arrive at better ideas about how to be healthy than someone who has followed a hunch. Medicine presupposes a hierarchy between the confusion the layperson will be in about what is wrong with him, and the more accurate knowledge available to doctors reasoning logically. … At the heart of Epicureanism is the thought that we are as bad at answering the question “What will make me happy?” as “What will make me healthy?” … Our souls do not spell out their troubles.

Sickness is the first warning that we have made a wrong judgement. A healthy person is never unhappy."

Philosophy, which formerly raised man to feel conscious of himself because he was a thinking being and to say, ‘I think therefore I am,” now raises him to say … “I think, therefore I am not,” (unless he takes thought into consideration only in that humble region where it is confused with action).