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To know that we know what we know, and that we do not know what we do not know, that is true knowledge.

Henry David Thoreau (1817-1862) American naturalist, poet and philosopher.

Knowledge becomes evil if the aim be not virtuous.

Plato (BC 427-BC 347) Greek philosopher.

Today knowledge has power. It controls access to opportunity and advancement.

Peter F. Drucker (1909-2005) American writer and management consultant.

True knowledge lies in knowing how to live.

Baltasar Gracian (1601-1658) Spanish Philosopher, and Writer.

I think I could, if I only knew how to begin. For, you see, so many out-of-the-way things had happened lately that Alice had begun to think that very few things indeed were really impossible.

Lewis Carroll (1832-1898) English mathematician and novelist.


Acquire new knowledge whilst thinking over the old, and you may become a teacher of others.

Confucius (BC 551-BC 479) Chinese philosopher.

Know, first, who you are, and then adorn yourself accordingly.

Epictetus (50-120) Greek philosopher.

It is impossible to begin to learn that which one thinks one already knows.

Epictetus (50-120) Greek philosopher.

We don't know one-millionth of one percent about anything.

Thomas Alva Edison (1847-1931) American inventor.

Knowledge of what is does not open the door directly to what should be.

Albert Einstein (1879-1955) German-Swiss-U.S. scientist.