I need to find the work in which this quote from Hilaire Belloc was taken.

"We sit by and watch the barbarianWe toletate him in the long stretches of peace, we are not afraid. We are tickled by his irreverences, his comic inversion of our old certitudes and our fixed creed refreshes us; we laught. But as we laugh we are watched by large and awful faces from beyond, and on these faces there are no smiles."