Quote by Christiaan Huygens
"The mind must be both flexible and firm—flexible in method, firm in principle."
"The mind must be both flexible and firm—flexible in method, firm in principle."
"The Universe is a great and noble course of things."
"Probability is the very guide of life."
"I have discovered that all human evil comes from this, man's being unable to sit alone in a quiet room."
"The telescope, by which things remote are brought near, shows us the Moon and planets in their true nature."