Never undertake anything unless you have the heart to ask Heaven's blessing on your undertaking.
Nowadays beautiful women are counted among the talents of their husbands.
A vacuum of ideas affects people differently than a vacuum of air, otherwise readers of books would be constantly collapsing.
With a pen in my hand I have successfully stormed bulwarks from which others armed with sword and excommunication have been repulsed.
A good means to discovery is to take away certain parts of a system to find out how the rest behaves.
When an acquaintance goes by I often step back from my window, not so much to spare him the effort of acknowledging me as to spare myself the embarrassment of seeing that he has not done so.
A book which, above all others in the world, should be forbidden, is a catalogue of forbidden books.
We have to believe that everything has a cause, as the spider spins its web in order to catch flies. But it does this before it knows there are such things as flies.
It is almost everywhere the case that soon after it is begotten the greater part of human wisdom is laid to rest in repositories.
There are people who possess not so much genius as a certain talent for perceiving the desires of the century, or even of the decade, before it has done so itself.
If it is permissible to write plays that are not intended to be seen, I should like to see who can prevent me from writing a book no one can read.
To do the opposite of something is also a form of imitation, namely an imitation of its opposite.
Some theories are good for nothing except to be argued about.
He who says he hates all kinds of flattery, and says so in earnest, has undoubtedly not as yet become acquainted with all kinds of it, whether in substance or in form.
The most successful tempters and thus the most dangerous are the deluded deluders.
The most heated defenders of a science, who cannot endure the slightest sneer at it, are commonly those who have not made very much progress in it and are secretly aware of this defect.
Do not commence your exercises in philosophy in those regions where an error can deliver you over to the executioner.
God creates the animals, man creates himself.
To see every day how people get the name 'genius' just as the wood-lice in the cellar the name 'millipede'-not because they have that many feet, but because most people don't want to count to 14-this has had the result that I don't believe anyone any more without checking.
Everyone is a genius at least once a year. The real geniuses simply have their bright ideas closer together.
Superstition originates among ordinary people in the early and all too zealous instruction they receive in religion: they hear of mysteries, miracles, deeds of the Devil, and consider it very probable that things of this sort could occur in everything anywhere.
The fear of death which is imprinted in men is at the same time a great expedient Heaven employs to hinder them from many misdeeds: many things are left undone for fear of imperiling one's life or health.
One use of dreams is that, unprejudiced by our often forced and artificial reflections, they represent the impartial outcome of our entire being.
Never trust a man who lays his hand on his heart when he assures you of anything.
The greatest things in the world are brought about by other things which we count as nothing: little causes we overlook but which at length accumulate.
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