The optimist proclaims that we live in the best of all possible worlds, and the pessimist fears this is true. (James Branch Cabell)

The power of accurate observation is frequently called cynicism by those who don’t have it. (George Bernard Shaw)

Everybody pities the weak; jealousy you have to earn. (Arnold Schwarzenegger)

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

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