"The fear of ridicule is the greatest enemy of progress."

"I never guess. It is a shocking habit—destructive to the logical faculty."

"It is stupidity rather than courage to refuse to recognize danger when it is close upon you."

"One should always look for a possible alternative and provide against it. It is the first rule of successful planning."

"It is only when you touch the higher that you realize how low we may be among the possibilities of creation."