"You cannot always control what goes on outside. But you can always control what goes on inside." - Wayne Dyer, American author

"Things don't change. You change your way of looking, that's all." - Carlos Castaneda, American author

"Nothing can stop the man with the right mental attitude from achieving his goal; nothing on earth can help the man with the wrong mental attitude." - Thomas Jefferson, American president

"Each morning when I open my eyes I say to myself: I, not events, have the power to make me happy or unhappy today." - Groucho Marx, American comedian

“I have found it of enormous value when I can permit myself to understand the other person.” - Carl Rogers, American psychologist

"When learning about life and people, make no more assumptions than are absolutely necessary. Ask and observe." - William of Occam, British philosopher

“Loyalty to a petrified opinion never yet broke a chain or freed a human soul.” - Mark Twain, American novelist

"We are complacently caught in our particular view of the world, which compels us to feel and act as if we knew everything about the world." - Carlos Castaneda, American author