I do not think there is any thrill that can
go through the human heart like that felt by the inventor
as he sees some creation of the brain unfolding to success . . .
Such emotions make a man forget food, sleep, friends, love, everything.

Nikola Tesla
"Nothing can stop the man 
with the right mental attitude 
from achieving his goal; 

nothing on earth 
can help the man 
with the wrong mental attitude."

Thomas Jefferson