The French Revolution influenced Burke = an example of how the pursuit of enlightened ideals like reason, progress, and imposing rational order could lead to horrific violence (the terror). The violence made it possible to criticise the excess of the enlightenment principles without appearing reactionary - too much change is not beneficial. Humans are flawed and not everything can be accounted for - the violence was because of flawed people - need for slow, gradual change (change to conserve), using prior knowledge. Built-in sense of caution.