There is a foolish corner in the brain of the wisest man. -Aristotle, philosopher (384-322 BCE)
Aristotle, a 4th-century-BCE philosopher, portrayed in 1493 Nuremberg Chronicle as a 15th-century-CE scholar (Photo credit: Wikipedia)

Bigotry tries to keep truth safe in its hand with a grip that kills it. -Rabindranath Tagore, philosopher, author, songwriter, painter, educator, composer, Nobel Prize in literature (1861-1941).
It is the mark of an educated mind to be able to entertain a thought without accepting it. -Aristotle, philosopher (384-322 BCE)
A chief event of life is the day in which we have encountered a mind that startled us. -Ralph Waldo Emerson, writer and philosopher (1803-1882).
To do the opposite of something is also a form of imitation. -Georg Christoph Lichtenberg, scientist and philosopher (1742-1799)
An individual human existence should be like a river: small at first, narrowly contained within its banks, and rushing passionately past rocks and over waterfalls. Gradually the river grows wider, the banks recede, the waters flow more quietly, and in the end, without any visible break, they become merged in the sea, and painlessly lose their individual being. -Bertrand Russell, philosopher, mathematician, author, Nobel laureate (1872-1970).
The root of all superstition is that men observe when a thing hits, but not when it misses. –Francis Bacon, essayist, philosopher, and statesman (1561-1626).