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

‎In the modern world of business, 

it is useless to be a creative, original thinker 

unless you can also sell what you create.

David Ogilvy