If the problem can be solved why worry? If the problem cannot be solved then worrying will do you no good.

Shantideva

Put fire into your workout any you burn off worry and frustration.

Suzanne Yoculan

Therefore do not worry about tomorrow, for tomorrow will worry about its own things.

Matthew 6:34

You must learn to let go. Release the stress. You were never in control anyway.

Steve Maraboli

There are a number of things to let go of in life. One of these things is worry of which there is nothing more unproductive or personally debilitating.

Catherine Pulsifer

Don't worry about breaks every 20 minutes ruining your focus on a task. Contrary to what I might have guessed, taking regular breaks from mental tasks actually improves your creativity and productivity. Skipping breaks, on the other hand, leads to stress and fatigue.

Tom Rath