That Schopenhauer has a wider public than have most philosophers is due partly to his style. He writes in language so singularly clear and lucid, that it can be followed easily by the general reader, not specially trained in a technical philosophical vocabulary. Of all German philosophers he is the greatest from a literary point of view. "The true philosopher," he writes, "will always seek after light and clearness, and will endeavour to resemble a Swiss lake, which through its peacefulness is able to unite great depth with great clearness, the depth revealing itself precisely by the clearness, rather than a turbid, impetuous mountain torrent." Philosophers have not always given much heed to this counsel of perfection. Obscurity of expression is merely the cloak in which men seek to hide their poverty of thought and triteness of mind. "Everyone," says Schopenhauer, "who possesses a beautiful and rich mind will always express himself in the most natural, direct, and simple way, concerned to communicate his thoughts to others and thus relieve the loneliness that he must feel in such a world as this."

Schopenhauer is a temperamental pessimist. In words of glowing and passionate eloquence he sets out to prove that all life is essentially sorrow. From his earliest days he had been abnormally sensitive to the misery that lies beneath the surface of life. Pain is essential to life and cannot be evaded. If it can find entrance in no other form, then it comes in the sad, grey garments of tedium and ennui.

The purest joy in life is that which lifts us out of our daily existence, and transforms us into disinterested spectators of it. This "divine release from the common ways of men" can only be found through art. But even this release, which is accessible only to the few, increases the capacity for suffering.

The final and only permanent solution of life is to be found in the life of the saint. True morality passes through virtue, which is rooted in sympathy, into asceticism. Art gives a marvellous consolation in life, but renunciation and self-surrender offer a complete release from the terrors and evils of existence. The veil of Mâyâ—the web of illusion—is lifted from man's eyes. He now shudders at the pleasures which recognise the assertion of life, and attains to the state of voluntary renunciation, resignation, and true indifference. Buddhism, Schopenhauer maintained, comes nearest of all religions to expressing this truth. It is here that he shows how profoundly Indian philosophy and religion had influenced him.

Throughout his life Schopenhauer was aggressively hostile towards all contemporary philosophers. To some extent, no doubt, his own failure to obtain academic recognition embittered him. But partly his attitude may be explained by the complete difference of method between them. Schopenhauer cares nothing at all about method. To Hegel and his contemporaries method was all-important. The historical method was the pathway which was followed with most enthusiasm at the time. It is especially for the historical method that Schopenhauer has the frankest contempt. Hegel and others were attempting to interpret present reality through history, seeking to show that through the slow process of history, unfolding itself in time, are revealed the organic principles which underlie the whole of life. Schopenhauer attaches practically no value to history as a highroad for philosophical inquiry. This way, he says, lie merely the dry bones of archæology and antiquarianism. To examine things historically is to look along a horizontal line. To think philosophically is to look along a vertical line. The latter is the rational and the more profound point of view. "What history narrates is in fact only the long, heavy, and confused dream of humanity." It is our inmost consciousness which is the real concern of the philosopher. "The true philosophy of history," he says, "consists in the insight into the causes of all these endless changes and their confusion. We have always before us the same even, unchanging nature, which to-day acts in the same way as yesterday. Thus it ought to recognise the identical in all events, in ancient as in modern times, in the East as in the West, and in spite of all difference in special circumstances, of costume and of custom, to see everywhere the same humanity. If one has read Herodotus, then in a philosophical regard one has read enough history. For everything is already there that makes up the subsequent history of the world."

That which is significant in itself, not in its relations, is to be found far more profoundly and distinctly in poetry than in history. There is, therefore, far more real, inner truth in poetry than in history. Aristotle held the same view, maintaining that poetry reveals a higher truth than history, for it strives to express the universal. "Poetry," he says, "is a more philosophical, and a higher thing than history."

In Schopenhauer's view, the true philosopher is the genius. His penetrative imagination will see farther and deeper than the learning of the mere scholar. The genius is a clear mirror of the inner nature of the universe. To him knowledge is the sun which reveals the world. His work may be regarded as an inspiration, as an interpretation of the spirit of beauty in art. He has been endowed by nature with a special faculty of inner vision, and uses his power to open the eyes of ordinary men. It is the genius who knows the inner nature of things, just as in Plato true philosophers are defined as "the lovers of the vision of truth, who are able to distinguish the idea from the objects which participate in the idea, and whose eyes are ever directed towards fixed and immutable principles." It is the genius, says Schopenhauer, who interprets his vision to the rest of mankind. He enables us to see the world through his eyes.

There was a wide difference, too, between Schopenhauer and other contemporary philosophers, in their attitude towards religion. Schopenhauer's freedom from academic fetters enabled him to steer an independent way. The German university professor was almost always dominated by the need for reconciling his philosophical theories with a theological creed. At times to square accounts between the two involved considerable ingenuity, as in the case of Kant. To Schopenhauer, to whom orthodox religion had always been a mere form, such attempts savoured of hypocrisy. Hence he always speaks slightingly of "philosophy-professors," and throughout his writings he makes bitter attacks upon them. Hegel's work is described as three-fourths utter absurdity, and one quarter as paradox, and he himself alluded to as "that intellectual Caliban." Plato's contempt for the sophists stands on very much the same plane of thought.

In spite of this attitude there is much in Schopenhauer's system, which is closely akin to Christianity on its mystical side. In his ethical theory he shows extraordinary points of agreement with the mediæval mystics. Materialism was utterly alien to his spirit. Materialists, he said, possess neither humanities nor culture, and their point of view filled him with the Olympian laughter of the gods. He always maintained that his theory of pessimism was more truly Christian, and more closely in accord with the spirit of primitive Christianity than the shallow optimism which crept into the later developments of that system. Its ascetic spirit he considered the kernel of Christianity. Protestantism represented for him a falling away from the earlier and purer form, and a transition to shallow rationalism.