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• Iron rusts from disuse, stagnant water loses its purity and in cold weather becomes froze
  even so does inaction sap the vigors of the mind. George Alle...
• Poor is the pupil who does not surpass his master... -- Leonardo da Vinci
• Patience serves as a protection against wrongs as clothes do against cold.
  For if you put on more clothes as the cold increases, it will have no power to hurt you....
• Not to anticipate is already to moan. -- Leonardo da Vinci
• It may be that a genius of the so-called universal type-- an Aristotle, for example, or a Leibniz or a Leonardo da Vinci-- is one whose mind has the group property.
  -- Cassius J. Keyse...
• All our knowledge has its origins in our perceptions. -- Leonardo da Vinci
• I have from an early age abjured the use of meat, and the time will come when men will look upon the murder of animals as they now look upon the murder of men.
  -- Leonardo Da Vinci...
• To develop a complete mind: Study the science of a
  study the art of science. Learn how to see. Realize that everything connects to everything else....