In Robert Browning's "Soliloquy of the Spanish Cloister," the speaker of the poem is a monk who has a serious problem with one of the other monks. We're not really sure why. Both "Gr-r-r" and "Hell dry you up with its flames!" were taken directly from the poem. This guy's not very nice. Or Christian.
(I started doodling a monk without a reference and I didn't realize that his... shall we say "skirt" was too short until too late)