Ce que j'admire dans les anciens philosophes, c'est le désir de conformer leurs mœurs à leurs écrits: c'est ce que l'on remarque dans Platon, Théophraste et plusieurs autres. La Morale pratique était si bien la partie essentielle de leur philosophie, que plusieurs furent mis à la tête des écoles, sans avoir rien écrit; tels que Xénocrate, Polémon, Heusippe, etc. Socrate, sans avoir donné un seul ouvrage et sans avoir étudié aucune autre science que la morale, n'en fut pas moins le premier philosophe de son siècle.

Of late, men seem to have been possessed by an incomprehensible impulse to strip themselves of everything with which nature has endowed them in order to make them superior to the beasts of burden. A philosopher is a gentleman who sits down four times a day to the best meals he can possibly obtain, and who considers that virtue, glory and noble sentiments should be indulged in only when they do not interfere with those four indispensable functions and all the rest of his little personal comforts. At this rate, a mule is a better philosopher by far, because in addition to all this he puts up with blows and hardship without complaint.

The movement of modern philosophy is back towards the position of the old Ionian philosophers, but strengthened and clarified by sound scientific ideas. If I publish my criticism on Comte, I should have to re-write it as a summary of philosophical ideas from the earliest times. The thread of philosophical development is not on the lines usually laid down for it. It goes from Democritus and the rest to the Epicureans, and then the Stoics, who tried to reconcile it with popular theological ideas, just as was done by the Christian Fathers. In the Middle Ages it was entirely lost under the theological theories of the time; but reappeared with Spinoza, who, however, muddled it up with a lot of metaphysics which made him almost unintelligible.

Thales was the father of ancient philosophy. His consternation, and the firm beliefs to which this gave rise, were transmitted to his pupils and to their pupils again. The law of heredity exercises as despotic and unlimited a sway in philosophy as in all other fields of organic existence. Let any one who doubts this cast a glance at any text-book. Since Hegel no one has dared imagine that the philosopher is able to think and inquire “freely”. The philosopher grows out of the past, like a plant out of the earth. Foreword xxxi

The natural philosophy of Democritus and some others, who did not suppose a mind or reason in the frame of things, but attributed the form thereof able to maintain itself to infinite essays or proofs of nature, which they term fortune, seemeth to me... in particularities of physical causes more real and better inquired than that of Aristotle and Plato; whereof both intermingled final causes, the one as a part of theology, and the other as a part of logic, which were the favourite studies respectively of both those persons. Not because those final causes are not true, and worthy to be inquired, being kept within their own province; but because their excursions into the limits of physical causes hath bred a vastness and solitude in that tract.

A great philosopher is always right and gives us to think even in what he does not manage to think, while a philosopher is limited to responding, hence to dissolving questions. There are three kinds of philosophers: those who do not respond to questions and hide them through ideology; those who respond to questions that they did not themselves raise and hope thus to clear up; and those who raise questions that no one ever thought of raising, insoluble questions that open the future. Descartes is one of these latter ones. That is why philosophy remains a continually open game.

Kierkegaard is not regarded as a philosopher, nor are Feuerbach and his pupil Nietzsche, but they are extraordinarily instructive. All who construct an empty system with facts are fools. Such is Bostrom, who tries to subtilise conceptions, analyse ideas, and classify and arrange God, man, and human life under heads.

It is the sophists, with Protagoras in the lead, who are the true precursors of modern thought; they are the "thinkers" properly so-called, in the sense that they limited themselves to reasoning and were hardly concerned with "perceiving" and taking into account that which "is". And it is a mistake to see in Socrates, Plato and Aristotle the fathers of rationalism, or even of modern thought generally; no doubt they reasoned − Shankara and Ramanuja did so as well − but they never said that reasoning is the alpha and omega of intelligence and of truth, nor a fortiori that our experiences or our tastes determine thought and have priority over intellectual intuition and logic, quod absit.

...Goethe was the wisest of mankind; too wise, perhaps, to be a philosopher in the technical sense, or to try to harness this wild world in a brain-spun terminology. It is true that he was all his life a follower of Spinoza, and that he may be termed, without hesitation, a naturalist in philosophy and a pantheist. His adherence to the general attitude of Spinoza, however, did not exclude a great plasticity and freedom in his own views, even on the most fundamental points. Thus Goethe did not admit the mechanical interpretation of nature advocated by Spinoza. He also assigned, at least to privileged souls, like his own, a more personal sort of immortality than Spinoza allowed.

The other species of philosophers consider man in the light of a reasonable rather than an active being, and endeavour to form his understanding more than cultivate his manners. They regard human nature as a subject of speculation; and with a narrow scrutiny examine it, in order to find those principles, which regulate our understanding, excite our sentiments, and make us approve or blame any particular object, action, or behaviour. They think it a reproach to all literature, that philosophy should not yet have fixed, beyond controversy, the foundation of morals, reasoning, and criticism; and should for ever talk of truth and falsehood, vice and virtue, beauty and deformity, without being able to determine the source of these distinctions. While they attempt this arduous task, they are deterred by no difficulties; but proceeding from particular instances to general principles, they still push on their enquiries to principles more general, and rest not satisfied till they arrive at those original principles, by which, in every science, all human curiosity must be bounded. Though their speculations seem abstract, and even unintelligible to common readers, they aim at the approbation of the learned and the wise; and think themselves sufficiently compensated for the labour of their whole lives, if they can discover some hidden truths, which may contribute to the instruction of posterity.

Once, Socrates was a sort of patron saint of philosophers. It was understood that philosophy was a way of questioning, musing, ruminating, living—a way of being a person.

Eventually, Aristotle appeared among the Greeks. He improved the methods of logic and systematized its problems and details. He assigned to logic its proper place as the first philosophical discipline and the introduction to philosophy. Therefore he is called the First Teacher.

human being is by nature a philosopher

Modern philosophy is usually considered to have begun with Descartes (1596-1650), who lived a generation after Galileo. The following is the usual image of Descartes and his philosophy: During the Middle Ages philosophy stood - if it stood independently at all - under the exclusive domination of theology and gradually degenerated into a mere analysis of concepts and elucidations of traditional opinion and propositions. It petrified into an academic knowledge which no longer concerned man and was unable to illuminate reality as a whole. Then Descartes appeared and liberated philosophy from this position. He began by doubting everything, but this doubt finally did run into something which could no longer be doubted, for, inasmuch as the skeptic doubts, he cannot doubt that he, the skeptic, is present and must be present in order to doubt at all. As I doubt I must admit that "I am." The "I," accordingly, is the indubitable. As a doubter, Descartes forced men into doubt in this way; he led them to think of themselves, as their "I." Thus the "I," human subjectivity, came to be declared the center of thought. From here originated the I-viewpoint of modern times and its subjectivism. p. 98-99