Science shows that what you think about affects the way you feel. In other words, if the only thoughts that cross your mind are negative, pessimistic and discouraging, it’s tough to keep a healthy outlook on things.

To refresh, take a break and enjoy some inspiring quotes from some of the world’s greatest thinkers. Sometimes it’s small reminders like this that have the greatest impact.

“Happiness is an attitude. We either make ourselves miserable, or happy and strong. The amount of work is the same.”
– Carlos Castaneda

“When one door of happiness closes, another opens, but often we look so long at the closed door that we do not see the one that has been opened for us.”
– Helen Keller

“You have brains in your head. You have feet in your shoes. You can steer yourself, any direction you choose.”
– Dr. Seuss

“Your work is going to fill a large part of your life, and the only way to be truly satisfied is to do what you believe is great work. And the only way to do great work is to love what you do.”
– Steve Jobs

“Instead of wondering when your next vacation is, you ought to set up a life you don’t need to escape from.”
– Seth Godin

“The problem with the rat race is that even if you win, you’re still a rat.”
– Lily Tomlin

“A man should never neglect his family for business.”
– Walt Disney

“Don’t say you don’t have enough time. You have exactly the same number of hours per day that were given to Helen Keller, Pasteur, Michaelangelo, Mother Teresea, Leonardo da Vinci, Thomas Jefferson, and Albert Einstein.”
– H. Jackson Brown Jr.

“Someone once told me that ‘time’ is a predator that stalks us all our lives. But I rather believe that time is a companion who goes with us on the journey and reminds us to cherish every moment because it will never come again.”
– Jean-Luc Picard

“It is not the strongest of the species that survive, nor the most intelligent, but the one most responsive to change.”
– Charles Darwin

“Opportunity is missed by most people because it is dressed in overalls and looks like work.”
– Thomas Edison

“You miss 100 percent of the shots you don’t take.”
– Wayne Gretzky

“Those who say it can not be done, should not interrupt those doing it.”
– Chinese Proverb

“Whatever the mind of man can conceive and believe, it can achieve. Thoughts are things! And powerful things at that, when mixed with definiteness of purpose, and burning desire, can be translated into riches.”
– Napoleon Hill

“Far and away the best prize that life offers is the chance to work hard at work worth doing.”
– Theodore Roosevelt

“Even if you are on the right track, you’ll get run over if you just sit there.”
– Will Rogers

“Yesterday’s home runs don’t win today’s games.”
– Babe Ruth

“If you work just for money, you’ll never make it, but if you love what you’re doing and you always put the customer first, success will be yours.”
– Ray Kroc