Heraclitus was an ancient Greek philosopher who lived between 535 BCE and 475 BCE. He was born in the city of Ephesus, which is located in modern-day Turkey. 

He was a “pre-Socratic” (before Socrates) philosopher, and much was lost about his life, but some great ideas and quotes have been preserved. 

One of the core concepts of his thinking was everything is in a constant state of becoming.

Chaos, and change is the natural state of the universe. Nothing will stay the same, and it would be insane to expect things in life to always remain static and stable. 

One of my favourite quotes of his: 

"No man ever steps in the same river twice, for it's not the same river and he's not the same man."

Heraclitus believed that the universe was in a state of constant flux, and that change was the only constant in life.

The lesson here is that you’re never the same person; everyday, your molecules, atoms, and cells change in your body. Who you were yesterday isn’t the same person you were today.

Don't let your perceptions of yourself from the past hold you back. You will never step in the same river twice, because you have lived and changed with time passing, and so has the river, as it too is constantly in motion.

Everything is energy, and everything is constantly in motion, so it's important to  match your energy to the life you desire. This involves a constant being with the flow, and accepting of the becoming parts of yourself, to live in harmony with the inner and outer environment.