Find Your Daily Dose of Inspiration: Quotes to Lift Your Spirit - page 242
The trick is not how much pain you feel--but how much joy you feel. Any idiot can feel pain. Life is full of excuses to feel pain, excuses not to live, excuses, excuses, excuses.
Lost motivation means that you broke promises to yourself and haven't corrected them yet. You need to believe in yourself again. This can only happen when you start fulfilling the small promises you make to yourself.
It becomes the urgent duty of mathematicians, therefore, to meditate about the essence of mathematics, its motivations and goals and the ideas that must bind divergent interests together.
An encouraged person will eventually get his drive from encouragement; he becomes more dependent. A person that never really receives encouragement learns to move out of spite; he becomes more independent.
The esteem of wise and good men is the greatest of all temporal encouragements to virtue; and it is a mark of an abandoned spirit to have no regard to it.
Everyone says "I wish I was in your shoes...", the hundreds of people that wish they were in my shoes don't know the tenth of it. If they were in my shoes they would cry like a baby.