My page numbers do not match yours, but I believe you are referring to St. John's description of Jane as being "'formed for labour, not for love.'"  He wants her to accompany him to India to be a missionary, and he believes that "'God and nature intended [her] for a missionary's wife" because she is so mentally capable and not physically beautiful.  Again, attention is drawn to Jane's plainness and to her lack of physical beauty just as it has been for so much of her life.  St. John says that he "claims" her, "'not for [his] pleasure, but...

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