A divine revelation must necessarily be intolerant of contradiction; it must repudiate all improvement in itself, and view with disdain that arising from the progressive intellectual development of man.

The scientific study of Nature tends not only to correct and ennoble the intellectual conceptions of man; it serves also to ameliorate his physical condition.

Over events, we may have some control, but over the law of life's progress none.

Experimental investigation, to borrow a phrase employed by Kepler respecting the testing of hypotheses, is "a very great thief of time." Sometimes it costs many days to determine a fact that can be stated in a line.

I have to deplore the systematic manner in which the literature of Europe has continued to put out of sight our obligations to the Muhammadans. Surely they cannot be much longer hidden. Injustice founded on religious rancour and national conceit cannot be perpetuated forever. The Arab has left his intellectual impress on Europe. He has indelibly written it on the heavens as any one may see who reads the names of the stars on a common celestial globe.

As a better knowledge of Nature was obtained, the sky was shown to be an illusionBut this did not take place without resistance. At first, the public, and particularly its religious portion, denounced the rising doubts as atheism.

In England Giordano Bruno had given lectures on the plurality of worlds, and in that country had written, in Italian, his most important works. It added not a little to the exasperation against him, that he was perpetually declaiming against the insincerity, the impostures, of his persecutors - that wherever he went he found skepticism varnished over and concealed by hypocrisy; and that it was not against the belief of men, but against their pretended belief, that he was fighting; that he was struggling with an orthodoxy that had neither morality nor faith.