Stashed in: Kaizen, Quotes!, Leonardo, Never give up.
Source is "Ancora Imparo" - inscribed next to an image of Father Time in a child's carriage.
As quoted in Curiosities of Literature (1823) by Isaac Disraeli: http://en.wikiquote.org/wiki/Michelangelo
Knowing is not enough; we must apply. Willing is not enough; we must do. ~Bruce Lee
What is Love? by Emma K, age 6
Wishing to be friends is quick work, but friendship is slow-ripening fruit. ~Aristotle
We are made of star-stuff. Our bodies are made of star-stuff. There are pieces of star within us all. ~Carl Sagan