Tim Ferriss

"I'm often asked how I define 'success.' It's an overused term, but I fundamentally view this elusive beast as a combination of two things, achievement and appreciation. One isn't enough: Achievement without appreciation makes you ambitious but miserable. Appreciation without achievement makes you unambitious but happy."

"The secret to achieving a breakthrough is to ask absurd questions, the power of these questions doesn't lie in their intimidation factor - instead, it's in their ability to strip away preconceptions and assumptions in order to uncover a new, radical, potentially brilliant idea, plan or strategy."