“While something in me,” he went on, “is acutely sensible to her charms, something else is as deeply impressed with her defects; they are such that she could sympathise in nothing I aspired to; cooperate in nothing I undertook. Rosamond a sufferer, a labourer, a female apostle? Rosamond a missionary’s wife? No!”
– Charlotte Bronte
Jane Eyre, Chapter 32. St. John Rivers may have received the missionary call from God, but he doesn’t believe Rosamond Oliver has. He is responding here to Jane’s suggestion that he should marry Rosamond. While he admits being attracted by Rosamond’s charms, he rules her out as a missionary’s wife. Rivers is not looking for love, but a wife who will benefit his work.