All human knowledge begins with intuitions, proceeds from thence to concepts, and ends with ideas.
By a lie a man throws away and, as it were, annihilates his dignity as a man.
Dare to know (Sapere Aude)! Have the courage to use your own intelligence!
Freedom is the alone un-originated birthright of man, and belongs to him by force of his humanity.
Have patience awhile; slanders are not long-lived.
He who makes himself a worm cannot complain afterwards that he gets stepped on.
I have no knowledge of myself as I am, but merely as I appear to myself.
Psychologists have hitherto failed to realize that imagination is a necessary ingredient of perception itself.
Reason itself does not work instinctively, but requires trial, practice, and instruction in order gradually to progress from one level of insight to another.
The senses do not err...not because they always judge rightly, but because they do not judge at all.
Truth is the child of time; erelong she shall appear to vindicate thee.
