Superficial knowledge is potentially more dangerous than ignorance. It gives a false sense of security encouraging an ignorant man to persevere in his efforts that can result in huge damage.

Spreading knowledge is the most effective weapon for defeating ignorance.

Problems often become worse if incompetent people try to solve them.

In general, people accumulate knowledge gradually over a long period of time. However, there are extraordinary people all around us, who are capable of accumulating impressive amounts of knowledge within a relatively short period of time. Nevertheless, even the greatest genius possesses only a small fraction of all knowledge known by mankind. Finally, the following question arises: how large is all the existing knowledge in comparison to the space of ignorance?

A good thing in one's ignorance is that one doesn't know that s/hedoesn't know.

The strictest judges are ignorant people.