A well-spent day brings happy
sleep.
Leonardo da Vinci

All our knowledge has its origins
in our perceptions.
Leonardo da Vinci

Although nature
commences with reason and ends in experience it is
necessary for
us to do the opposite, that is to commence with experience
and
from this to proceed to investigate the reason.
Leonardo da
Vinci

Anyone who conducts an argument by appealing to
authority is not using
his intelligence; he is just using his
memory.
Leonardo da Vinci

Art is never finished, only
abandoned.
Leonardo da Vinci

As a well-spent day brings
happy sleep, so a life well spent brings happy
death.