Quote by Christiaan Huygens
"Understanding is not given; it is earned through persistent effort."
More from Christiaan Huygens
"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."