Cain, in Byron's poem, asks of Lucifer, the prince of the intellectuals, "Are ye happy?" and Lucifer replies, "We are mighty." Cain questions again, "Are ye happy?" and then the great Intellectual says to him: "No; art thou?" And further on, this same Lucifer says to Adah, the sister and wife of Cain: "Choose betwixt love and knowledge--since there is no other choice." And in the same stupendous poem, when Cain says that the tree of the knowledge of good and evil was a lying tree, for "we know nothing; at least it promised knowledge at the price of death," Lucifer answers him: "It may be death leads to the highest knowledge"--that is to say, to nothingness. To this word _knowledge_ which Lord Byron uses in the above quotations, the Spanish _ciencia_, the French _science_, the German _Wissenschaft_, is often opposed the word _wisdom, sabiduria, sagesse, Weisheit_. Knowledge comes, but Wisdom lingers, and he bears a laden breast, Full of sad experience, moving toward the stillness of his rest, says another lord, Tennyson, in his _Locksley Hall_. And what is this wisdom which we have to seek chiefly in the poets, leaving knowledge on one side? It is well enough to say with Matthew Arnold in his Introduction to Wordsworth's poems, that poetry is reality and philosophy illusion; but reason is always reason and reality is always reality, that which can be proved to exist externally to us, whether we find in it consolation or despair. I do not know why so many people were scandalized, or pretended to be scandalized, when Brunetière proclaimed again the bankruptcy of science. For science as a substitute for religion and reason as a substitute for faith have always fallen to pieces. Science will be able to satisfy, and in fact does satisfy in an increasing measure, our increasing logical or intellectual needs, our desire to know and understand the truth; but science does not satisfy the needs of our heart and our will, and far from satisfying our hunger for immortality it contradicts it. Rational truth and life stand in opposition to one another. And is it possible that there is any other truth than rational truth?