What quote/quotes do you believe most effectively explains the essence, meaning of magick?

You couldn’t open this feed without adding, what is arguably the most popular definition of magick, particularly from an occultists perspective.

“Magick is the science and art of causing change to occur in conformity with the Will.” – Aleister Crowley, (The Book of Thoth)

I would love to read your suggestions, feel free to add your own.