One of the qualities Rochester loves and admires in Jane is her uprightness. While willing to help him in any way she can, he knows she wouldn’t lift one of her fairy-like fingers if he asked her to do something she thought wrong. As he learns when she walks away from him after being confronted with his wrong-headed plans.
I liked the implicit competence in the ‘light-footed running’ and ‘neat-handed alacrity’.
‘… for if I bid you do what you thought wrong, there would be nolight-footed running, no neat-handed alacrity…’
Source: Charlotte Bronte, Jane Eyre (London: Bounty Books, 2012 (1847)), p. 282