He who establishes his argument by noise and command shows that his reason is weak.
Where so many hours have been spent in convincing myself that I am right, is there not some reason to fear I may be wrong?
The only reason for time is so that everything doesn't happen at once.
Reason has always existed, but not always in a reasonable form.
Ridicule is the only weapon which can be used against unintelligible propositions. Ideas must be distinct before reason can act upon them; and no man ever had a distinct idea of the trinity. It is the mere Abracadabra of the mountebanks calling themselves the priests of Jesus.
Happiness is not an ideal of reason, but of imagination.
I must create a system or be enslaved by another mans; I will not reason and compare: my business is to create.
It is useless to attempt to reason a man out of a thing he was never reasoned into.
Everything that is beautiful and noble is the product of reason and calculation.
No real blood flows in the veins of the knowing subject constructed by Locke, Hume, and Kant, but rather the diluted extract of reason as a mere activity of thought.
Man is a rational animal who always loses his temper when he is called upon to act in accordance with the dictates of reason.
Do something everyday for no other reason than you would rather not do it, so that when the hour of dire need draws nigh, it may find you not unnerved and untrained to stand the test.
He that cannot reason is a fool. He that will not is a bigot. He that dare not is a slave.
Thinking is the hardest work there is, which is probably the reason why so few engage in it.
The important thing is not to stop questioning. Curiosity has its own reason for existing. One cannot help but be in awe when he contemplates the mysteries of eternity, of life, of the marvelous structure of reality. It is enough if one tries merely to comprehend a little of this mystery every day. Never lose a holy curiosity.
For in reason, all government without the consent of the governed is the very definition of slavery.
They that will not be counseled, cannot be helped. If you do not hear reason she will rap you on the knuckles.
Anger is never without a reason, but seldom with a good one.