Wrongly do men cry out against experience and with bitter re- proaches accuse her of deceitfulness. Let experience alone, and rather turn your complaints against your own ignorance, which causes you to be so carried away by your vain and insensate desires as to expect from experience things which are not within her power!

Truth is by nature self-evident. As soon as you remove the cobwebs of ignorance that surround it, it shines clear.

Thoroughly conscious ignorance is the prelude to every real advance in science.

The more one thinks, the more one feels the hopeless immensity of man's ignorance.

Ignorance more frequently begets confidence than does knowledge: it is those who know little, and not those who know much, who so positively assert that this or that problem will never be solved by science.

It is always advisable to perceive clearly our ignorance.