-I am never weary of being useful…in serving others I cannot do enough.
-To enjoy–to love a thing for its own sake and for no other reason
-The time will come when men such as I will look upon the murder of animals as they now look upon the murder of men.
-Make your work to be in keeping with your purpose.
-I have offended God and mankind because my work did not reach the quality it should have.
-As a well-spent day brings happy sleep, so life well used brings happy death.
Leonardo da Vinci