Here are some of the most popular and inspiring quotes:
"Believe you can and you're halfway there." - Theodore Roosevelt
"Success is not final, failure is not fatal: it is the courage to continue that counts." - Winston Churchill
"The greatest glory in living lies not in never falling, but in rising every time we fall." - Nelson Mandela
"Don't watch the clock; do what it does. Keep going." - Sam Levenson
"I have learned over the years that when one's mind is made up, this diminishes fear." - Rosa Parks
"Successful and unsuccessful people do not vary greatly in their abilities. They vary in their desires to reach their potential." - John Maxwell
"Be the change you wish to see in the world." - Mahatma Gandhi
"You miss 100% of the shots you don't take." - Wayne Gretzky
"It does not matter how slowly you go as long as you do not stop." - Confucius
"Success is not how high you have climbed, but how you make a positive difference to the world." - Roy T. Bennett
"Keep your face always toward the sunshine—and shadows will fall behind you." - Walt Whitman
"The only limit to our realization of tomorrow will be our doubts of today." - Franklin D. Roosevelt
These quotes can serve as inspiration and encouragement in difficult times and help you maintain a positive and motivated outlook on life.