All that I know is nothing - I'm not even sure of that.

Once and for all, there are many things I choose not to know.-Wisdom sets limits even to knowledge.

Never be afraid of not knowing. Find out.

The foundation of our Empire was not laid in the gloomy age of Ignorance and Superstition, but at an Epoch when the rights of mankind were better understood and more clearly defined than at any former period, the researches of the human mind, after social happiness, have been carried to a great extent, the Treasures of knowledge, acquired by the labours of Philosophers, Sages and Legislatures, through a long succession of years, are laid open for our use, and their collected wisdom may be happily applied in the Establishment of our forms of Government.

The benefits of knowledge can only be realized in practice.

Show me a family of readers, and I will show you the people who move the world.