Looking for episode where chuck quotes Thomas Babington Macaulay

[QuillQuickcard]

Can anybody help me find this episode? It is the one where chuck quotes Thomas Babington Macaulay:
We cannot absolutely prove that those are in error who say that society has reached a turning point - that we have seen our best days. But so said all who came before us and with just as much apparent reason. On what principle is it that with nothing but improvement behind us, we are to expect nothing but deterioration before us?
Chuck also talks in this episode about how a poor village could be greatly improved simply by introducing soap

I could really use the optimistic view of the future right now