There is much pleasure to be gained from useless knowledge.

All the knowledge I possess everyone else can acquire but my heart is all my own.

Knowledge without justice ought to be called cunning rather than wisdom.

Opinion is the medium between knowledge and ignorance.

The learning and knowledge that we have is at the most but little compared with that of which we are ignorant.

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.

Human behavior flows from three main sources: desire emotion and knowledge.

It is not when truth is dirty but when it is shallow that the lover of knowledge is reluctant to step into its waters.

To know is to know that you know nothing. That is the meaning of true knowledge.

Perplexity is the beginning of knowledge.