“So after considering everything very thoroughly, I must finally conclude that this proposition, I am, I exist, is necessarily true whenever it is put forward by me or conceived in my mind.” -Rene Descartes, Meditations on First Philosophy

“...her wings are cut and then she is blamed for not knowing how to fly.” (Simone De Beauvoir, the second sex)

On a given finite straight line to construct an equilateral triangle," (Euclid, Book 1)

"Courage is a mean with regard to fear and confidence... the brave man is he who faces and fears the right things and from the right motive, in the right way and at the right time, and who feels confidence under the corresponding conditions"