He who has a ‘why’ to live, can bear with almost any ‘how’. (Friedrich Nietzsche)

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

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

Black holes are where God divided by zero. (Steven Wright)

Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth. (Sherlock Holmes (by Sir Arthur Conan Doyle, 1859-1930))