The greatest discovery of all time is that a person can chan... - Lewis, David

"The greatest discovery of all time is that a person can change his future by merely changing his attitude."

Lewis, David Motivation

Philosopher American 1941–2001

More from Lewis, David

"The things we love tell us what we are."

"To be is to do."

"Knowledge is power."

"Life is what happens when you're busy making other plans."

"I believe in working hard for what you want."

"Never underestimate the power of determination."

"I don't need a reason to fight."

"The most important thing is the mission. Nothing else matters."