To know, is to know that you know nothing. That is the meaning of true knowledge. – Socrates
It is not when truth is dirty, but when it is shallow, that the lover of knowledge is reluctant to step into its waters. – Friedrich Nietzsche
Human behavior flows from three main sources: desire, emotion, and knowledge. – Plato
To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge. – Nicolaus Copernicus
Entire ignorance is not so terrible or extreme an evil, and is far from being the greatest of all too much cleverness and too much learning, accompanied with ill bringing-up, are far more fatal. – Plato
The learning and knowledge that we have, is, at the most, but little compared with that of which we are ignorant. – Plato
Opinion is the medium between knowledge and ignorance. – Plato
Knowledge without justice ought to be called cunning rather than wisdom. – Plato
There is much pleasure to be gained from useless knowledge. – Bertrand Russell
The possession of knowledge does not kill the sense of wonder and mystery. There is always more mystery. – Anais Nin
Knowledge which is acquired under compulsion obtains no hold on the mind. – Plato
Knowledge is true opinion. – Plato
Doubt grows with knowledge. – Johann Wolfgang von Goethe
Let us tenderly and kindly cherish, therefore, the means of knowledge. Let us dare to read, think, speak, and write. – John Adams
We know accurately only when we know little, with knowledge doubt increases. – Johann Wolfgang von Goethe
One whose knowledge is confined to books and whose wealth is in the possession of others, can use neither his knowledge nor wealth when the need for them arises. – Chanakya
Knowledge has to be improved, challenged, and increased constantly, or it vanishes. – Peter Drucker
Even the knowledge of my own fallibility cannot keep me from making mistakes. Only when I fall do I get up again. – Vincent Van Gogh
All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason. – Immanuel Kant
All our knowledge has its origins in our perceptions. – Leonardo da Vinci
