[Nikolay] Valentinov … recorded his shock at Lenin’s certainty not only that Marx and Engels were absolutely correct, but that no fundamental principle they enunciated, about anything, could ever be changed. “Nothing in Marxism is subject to revision,” Lenin told him. “There is only one answer to revisionism: Smash its face in!”
—Gary Saul Morson, Wonder Confronts Certainty: Russian Writers on the Timeless Questions and Why Their Answers Matter
Do not think that the knowledge that you presently possess is changeless, absolute truth. Avoid being narrow-minded and bound to present views. Learn and practice nonattachment from views in order to be open to receive others’ viewpoints. Truth is found in life and not merely in conceptual knowledge. Be ready to learn throughout your entire life and to observe reality in yourself and in the world at all times.
—Thich Nhat Hanh, Interbeing: Commentaries on the Tiep Hien Precepts