“We know a history so that we can learn from it. We learn our history because we understand the sacrifices that were made before, so that when we make sacrifices we understand we're doing it on behalf of future generations. There’s a proverb that says, “We have not inherited this land from our forebears, we have borrowed it from our children.” In other words, we study the past so it can guide us into the future, and inspire us to do better.”

In: Philosophy & Social Action (2003)

Presidential campaign (April 12, 2015 – 2016), Speech about the Orlando Shooting (June 13, 2016)

2013, Cape Town University Address (June 2013)
Context: We always have the opportunity to choose our better history. We can always understand that most important decision -- the decision we make when we find our common humanity in one another. That’s always available to us, that choice. [... ] it can be heard in the confident voices of young people like you. It is that spirit, that innate longing for justice and equality, for freedom and solidarity -- that’s the spirit that can light the way forward. It's in you.

Preface.
A History of Science Vol.2 Hellenistic Science and Culture in the Last Three Centuries B.C. (1959)

1940 - 1948, Intimate Banalities' (1941)

2009, Speech: The Socio-Economic Peace Program of Senator Francis Escudero