The struggling for knowledge hath a pleasure in it like that of wrestling with a fine woman.

Real knowledge is to know the extent of one's ignorance.
Knowledge is a comfortable and necessary retreat and shelter for us in advanced age.
Knowledge advances by steps, and not by leaps.
Knowledge is more than equivalent to force. The master of mechanics laughs at strength.
The fruit of the tree of knowledge always drives man from some paradise or another.
The air we breathe is made up of four elements, at least: oxygen, nitrogen, carbonic acid gas, and knowledge.

Knowledge is like money: to be of value it must circulate, and in circulating it can increase in quantity and, hopefully, in value.
The larger the island of knowledge, the longer the shoreline of wonder.
It is the province of knowledge to speak and it is the privilege of wisdom to listen.