Professor Jeremy Waldron, University Professor at the New York University Law School, delivers the fourth in the 2015 Gifford Lecture series, entitled "A Load-bearing Idea: The Work of Human Equality". Defending basic equality is not just a matter of ‘coming up with’ some suitably shaped property that all humans share. The description must be relevant to the work that basic equality has to do. That work is comprehensive and foundational, across all aspects of morality. Recorded on 2 February 2015 at the University of Edinburgh's Playfair Library.