To know what you know and what you do not know, that is true knowledge.
Knowledge is of no value unless you put it into practice.
It is not ignorance but knowledge which is the mother of wonder.
A little knowledge is a dangerous thing. So is a lot.
The possession of knowledge does not kill the sense of wonder and mystery. There is always more mystery.
Nothing is too small to know, and nothing is too big to attempt.
Real knowledge is to know the extent of one's ignorance.
Knowledge is in every country the surest basis of public happiness.
How dreadful knowledge of the truth can be when there's no help in truth!
Knowledge is proud that he has learned so much; Wisdom is humble that he knows no more.