Who said "The true mathematician asks not 'Why?' but 'Why not?'"?

This quote is attributed to Leonhard Euler.

The true mathematician asks not 'Why?' but 'Why not?' - Leonhard Euler

"The true mathematician asks not 'Why?' but 'Why not?'"

Leonhard Euler Creativity

Mathematician Swiss 1707–1783

"Read Euler, read Euler, he is the master of us all."

"The beauty of a mathematical proof lies not in its length but in its elegance."

"Life is but a moment, yet mathematics is eternal."

"In mathematics, you don't understand things. You just get used to them."

"When life gives you lemons, make something beautiful."

"Creativity knows no bounds."

"Creativity is the expression of the soul."

"I'm making this up as I go."