"When you believe in a thing, believe in it all the way, implicitly and unquestionable."
Walt Disney

"To accomplish great things, we must not only act, but also dream; not only plan, but also believe."
Anatole France

"If you believe in what you are doing, then let nothing hold you up in your work. Much of the best work of the world has been done against seeming impossibilities. The thing is to get the work done."
Dale Carnegie

"Man is made by his belief. As he believes, so he is."
Johann Wolfgang von Goethe

"Whatever you believe with feeling becomes your reality."
Brian Tracy

"It's lack of faith that makes people afraid of meeting challenges, and I believe in myself." 
Muhammad Ali

"Believe deep down in your heart that you're destined to do great things."
Joe Paterno

"Believe and act as if it were impossible to fail." 
Charles Kettering

"What the mind of man can conceive and believe, it can achieve." 
Napoleon Hill

"If people believe in themselves, it's amazing what they can accomplish." 
Sam Walton

"Don't believe what your eyes are telling you. All they show is limitation. Look with your understanding, find out what you already know, and you'll see the way to fly."
Richard Bach

"If I have the belief that I can do it, I shall surely acquire the capacity to do it even if I may not have it at the beginning."
Mahatma Gandhi