“I think you can understand time just by the fact that everything, everything changes. Everything ages. You’re born, you die. The living beings as the objects if they are new, then they become old. Even the stones, even in our Earth, aged four and a half billion years, has changed enormously. So we can define time only thanks to the fact that everything changes.”
Interview with Euronews' Claudio Rocco in 2011; as quoted in " Science says 'ciao' to Italy's Margherita Hack: the 'lady of the stars'", euronews.com (1 July 2013) https://www.euronews.com/2013/07/01/science-says-ciao-to-italy-s-margherita-hack-the-lady-of-the-stars.
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Margherita Hack 2
Italian astrophysicist and popular science writer 1922–2013Related quotes

“Everything's destiny is to change, to be transformed, to perish. So that new things can be born.”

XVII. That the World is by nature Eternal.
On the Gods and the Cosmos

“Everything passes,
Everything changes,
Just do what you think you should do.”
“The new disease of our age is being OK doing everything at exactly the same time.”
Your Job-Hunt Ltd – Advice from an Award-Winning Asian Headhunter (2003), Successful Recruitment in a Week (2012) https://books.google.ae/books?idp24GkAsgjGEC&printsecfrontcover&dqnigel+cumberland&hlen&saX&ved0ahUKEwjF75Xw0IHNAhULLcAKHazACBMQ6AEIGjAA#vonepage&qnigel%20cumberland&ffalse, 100 Things Successful People Do: Little Exercises for Successful Living (2016) https://books.google.ae/books?idnu0lCwAAQBAJ&dqnigel+cumberland&hlen&saX&ved0ahUKEwjF75Xw0IHNAhULLcAKHazACBMQ6AEIMjAE

Talking about the differences with his new band. (Audioslave) ** Sixty Seconds with Chris, April 7, 2003 http://www.smh.com.au/articles/2003/04/06/1049567563283.html,
Audioslave Era