Non-violence leads to the highest ethics, which is the goal of all evolution. Until we stop harming all other living beings, we are still savages.
— Thomas A. Edison

Even savage animals can agree among themselves.
Juvenal savage quote

The most savage controversies are those about matters as to which there is no good evidence either way.
— Bertrand Russell

The savage in man is never quite eradicated.
— Henry David Thoreau

Of all the infirmities we have, the most savage is to despise our being.
— savage quotation by Michel de Montaigne