Warren Buffett

"The difference between successful people and really successful people is that really successful people say no to almost everything."

"You cannot control your time unless you say no, and you cannot let other people set your agenda in life."

"I insist on spending a lot of time just sitting and thinking, because fewer decisions made with better judgment outperform constant activity."

"We don’t have to be smarter than the rest, we just have to be more disciplined than the rest."

"Leaders protect Monday mornings for thinking."

"Leaders do the hard thinking on Monday."