Everybody has noticed the way cats stop and loiter in a half-open door. Hasn't everyone said to a cat: For heavens sake why don't you come in? With opportunity half-open in front of them, there are men who have a similar tendency to remain undecided between two solutions, at the risk of being crushed by fate abruptly closing the opportunity. The overprudent, cats as they are, and because they are cats, sometimes run more danger than the bold

He who is not master of his own thoughts is not accountable for his own deeds.

There is no supernatural, there is only nature. Nature alone exists and contains all. All is. There is the part of nature that we perceive, and the part of nature that we do not perceive. ... If you abandon these facts, beware; charlatans will light upon them, also the imbecile. There is no mean: science, or ignorance. If science does not want these facts, ignorance will take them up. You have refused to enlarge human intelligence, you augment human stupidity. When Laplace withdraws Cagliostro appears.

These are dark radiances. They have no suspicion that they are to be pitied. Certainly they are so. He who does not weep does not see. They are to be admired and pitied, as one would both pity and admire a being at once night and day, without eyes beneath his lashes but with a star on his brow.

She loved with so much passion as she loved with ignorance. She did not know whether it were good or evil, beneficent or dangerous, necessary or accidental, eternal or transitory, permitted or prohibited: she loved.

Nothing is more dangerous than discontinued labor; it is habit lost. A habit easy to abandon, difficult to resume.

Where the telescope ends the microscope begins, and which has the wider vision?