Each problem that I solved became a rule which served afterwards to solve other problems. (Rene Descartes, Discours de la Methode)

Only two things are infinite, the universe and human stupidity, and I’m not sure about the former. (Albert Einstein)

Nothing in the world is more dangerous than sincere ignorance and conscientious stupidity. (Martin Luther King Jr.)

If you are going through hell, keep going. (Sir Winston Churchill)

Victory goes to the player who makes the next-to-last mistake. (Chessmaster Savielly Grigorievitch Tartakower)

The fundamental cause of trouble in the world is that the stupid are cocksure while the intelligent are full of doubt. (Bertrand Russell)

Many a man’s reputation would not know his character if they met onthe street. (Elbert Hubbard)

Against stupidity, the gods themselves contend in vain. (Friedrich von Schiller)

You can avoid reality, but you cannot avoid the consequences of avoiding reality. (Ayn Rand)

An inconvenience is only an adventure wrongly considered; an adventure is an inconvenience rightly considered. (Gilbert Keith Chesterton)