Prejudices, it is well known, are most difficult to eradicate from the heart whose soil has never been loosened or fertilised by education: they grow there, firm as weeds among stones.

– Charlotte Bronte

Jane Eyre, Chapter 29. Jane says this about old servant Hannah, who at first judged her and refused her shelter when she knocked on the door of Moor House. Jane uses a gardening metaphor and simile to compare the heart to soil, where prejudices can grow like weeds if there is no education to fertilize it.