Who said "Life is struggle, and in struggle there is progress."?

This quote is attributed to Elie Metchnikoff.

Life is struggle, and in struggle there is progress. - Elie Metchnikoff

"Life is struggle, and in struggle there is progress."

Elie Metchnikoff Life

Immunologist Russian 1845–1916

"Man can adapt himself to anything, but he cannot adapt himself to anything without effort."

"The study of the lower organisms is the key to the understanding of man."

"Optimism is a moral duty."

"Life is a process of constant transformation."

"Life is meant to be lived with passion."

"Life is what happens when you're busy making other plans."

"Life is a journey, not a destination."

"Life's too short for regrets."