“A stumbling block to the pessimist is a stepping-stone to the optimist.”
“One of the Secrets in Life is to Make Stepping Stones out of Stumbling Blocks.”
“There will always be rocks in the road ahead of us. They will be stumbling blocks or stepping stones; it all depends on how you use them.”
“The difference between an optimist and a pessimist? An optimist laughs to forget but a pessimist forgets to laugh.”
“Both optimists and pessimists contribute to society. The optimist invents the aeroplane, the pessimist the parachute.”
“The the question whether I am a pessimist or an optimist, I answer that my knowledge is pessimistic, but my willing and hope are optimistic.”