A brayer is a thorny shrub and this image is visceral because even this plant, this piece of nature that Blake adores so much is used against him by the church to cause him agony.

荆棘是一多刺的灌，形象是发自内心的，为即使是植物，莱克如此崇拜的自然景观，也被教会用来对付他，给他带来痛苦。