Philosophy means the complete liberty of the mind, and therefore independence of all social, political, or religious prejudice. It is to begin with neither Christian nor pagan, neither monarchical nor democratic, neither socialist nor individualist; it is critical and impartial; it loves one thing only--truth. If it disturbs the ready-made opinions of the church or the state--of the historical medium--in which the philosopher happens to have been born, so much the worse, but there is no help for it. “Est ut est aut non est,” Philosophy means, first, doubt; and afterward the consciousness of what knowledge means, the consciousness of uncertainty and of ignorance, the consciousness of limit, shade, degree, possibility. The ordinary man doubts nothing and suspects nothing. The philosopher is more cautious, but he is thereby unfitted for action, because, although he sees the goal less dimly than others, he sees his own weakness too clearly, and has no illusions as to his chances of reaching it. The philosopher is like a man fasting in the midst of universal intoxication. He alone perceives the illusion of which all creatures are the willing playthings; he is less duped than his neighbor by his own nature. He judges more sanely, he sees things as they are. It is in this that his liberty consists--in the ability to see clearly and soberly, in the power of mental record. Philosophy has for its foundation critical lucidity. The end and climax of it would be the intuition of the universal law, of the first principle and the final aim of the universe. Not to be deceived is its first desire; to understand, its second. Emancipation from error is the condition of real knowledge. The philosopher is a skeptic seeking a plausible hypothesis, which may explain to him the whole of his experiences. When he imagines that he has found such a key to life he offers it to, but does not force it on his fellow men.