What you think and what you do matter. Aristotle (384-322 B.C.) said it first. In his Principle of Causality (or the Law of Cause and Effect) the great philosopher taught that for every effect there is a specific cause. Everything happens for a reason.

With this in mind, imagine what you can accomplish if you know specifically what you want and set your energies in that direction. "In the arena of human life the honors and rewards fall to those who show their good qualities in action," he said.
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EQUAL AND OPPOSITE REACTION
"For every action, there is an equal and opposite reaction," ~ Isaac Newton (1642-1727)

Another genius, Sir Isaac's third principle of motion supports Aristotle's law. Push or pull. Good or bad. Every action has an equally opposite reaction. Newton's brilliance led directly to Albert Einstein's 20th Century concepts of space and time.
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SEEDS YOU PLANT
"Don't judge each day by the harvest you reap, but by the seeds you plant." ~ Robert Louis Stevenson (1850-94)

The Bible said it: You reap what you sow. The good you do today will blossom tomorrow. The key to success is to figure what you need to do to achieve your most important goals and determine the steps you have to take to get from wherever you are to wherever you want to go.

"If a man would reap praise, you must sow the seeds, gentle words and useful deeds." ~ Benjamin Franklin (1706-1790)

What you do matters!