Who said "To climb without slipping backward is not possible."?

This quote is attributed to Henrik Ibsen.

To climb without slipping backward is not possible. - Henrik Ibsen

"To climb without slipping backward is not possible."

Henrik Ibsen Perseverance

Playwright Norwegian 1828–1906

"The strongest man in the world is he who stands most alone."

"One can never go back. Bygones are gone forever. One can only go forward."

"Liberty is the first condition for anything good."

"A thousand words will not leave so deep an impression as one deed."

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."