Wealth consists not in having great possessions, but in having few wants.
Never look for your work in one place and your progress in another.
Not every difficult and dangerous thing is suitable for training, but only that which is conducive to success in achieving the object of our effort.
Fortify yourself with contentment, for this is an impregnable fortress.
What is learned without pleasure is forgotten without remorse.
Freedom and happiness are won by disregarding things that lie beyond our control.