To this question teleology alone responds. But every teleological affirmation respecting the universe is a religious affirmation. Science, studying only accomplished facts, never establishes anything but phenomena and their antecedent or concomitant conditions. Once the phenomenon is integrated in the causal series, the task of science is accomplished. To ask it to go further is to ask it to go beyond its limits and to denaturalise itself. You can only put teleology into the universe by affirming the sovereignty of spirit. To say that there is reason, that there is thought, in things--that they move towards an end or realise an order, a harmony, a good: this is to say that matter is subordinate to spirit. Now, to affirm this sovereignty of spirit is to commit that act of initial religious faith of which I spoke at the beginning; it is to feel in one's self and in the world something besides matter, the mysterious energy of spirit. This act of faith--legitimate because inevitable--belongs to the subjective order of religious life, not to the objective order of science. Teleology and the theory of final causes have been compromised because their specific character has been mistaken; they have sometimes been assimilated to, and sometimes substituted for, mechanical causes in the explanation of phenomena. For an unknown scientific explanation has been substituted an appeal to a supernatural intention or volition of God. The savants rightly protested against this. God, who is the final reason of everything, is the scientific explanation of nothing. The object of science is to search for second causes; where these do not appear there is no science. It is faith which replaces it. To say that God created the world, or that the world tends toward the sovereign good, is not to advance positive science a single step. On the other hand, to explain the phenomena of rain, or thunder, or the fall of bodies, is to dissipate some mythological conceptions; but it is not to suppress the religious affirmation of spirit that the mechanism of the universe has an end, and that the laws of gravitation and the material forces serve some purpose of which they are ignorant, and which is of more value than themselves. Between the discoveries of science and the postulates of the religious and moral life there is always necessarily formed a synthesis which is destroyed at each step, but which rises again higher and larger than before. Mechanism itself, in order to be intelligible, calls for teleology. The text of the material world awaits the interpretation that spirit gives of it. By its discoveries positive science establishes the text. Without this rigorous establishment of the text, the exegesis of consciousness remains a phantasy. But, without that exegesis, the text itself signifies nothing; it is almost as if it did not exist.