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
The learning and knowledge that we have, is, at the most, but little compared with that of which we are ignorant. Plato Knowledge Learning
If knowledge can create problems, it is not through ignorance that we can solve them. Isaac Asimov Knowledge
There are in fact two things, science and opinion; the former begets knowledge, the later ignorance. Hippocrates Knowledge