"I am not an optimist. I am a realist. I believe that we must be prepared for the worst, and hope for the best."

"I am not afraid of death, because I know that I have lived a full life."

"We may be living in a world where the future is already written, but we still have the power to change it."

"I am a physicist, and I believe that the laws of physics are universal."

"I believe that science is the key to understanding the universe, and to solving the problems of humanity."