In Jane Eyre, how do Jane's values influnce the choices she makes?

The best way to answer this question is to look at how
Jane decides to resist her inner desires and follow Rochester to Europe and become his
mistress. Clearly, this is one of the crucial decisions that she needs to make in this
excellent novel, and if we examine Chapter Twenty-Seven in particular, we can see how
her values and her beliefs help her at this stage to make a wise decision and to prevent
her from becoming nothing but a powerless mistress who would never be Rochester's equal.
Even though Jane is friendless in the world and without family, she decides that her own
sense of self-worth is still something worth fighting
for:

"I care
for myself. The more solitary, the more friendless, the more unsustained I am, the more
I will respect myself. I will keep the law given by God; sanctioned by man. I will hold
to the principles received by me when I was sane, and not mad--as I am now. Laws and
principles are not for the times when there is no temptation: they are for such moments
as this, when body and soul rise in mutiny against their rigour; stringent are they;
inviolate they shall be. If at my individual convenience I might break them, what would
be their worth?"

Note the way
that again and again Jane's own moral code and set of values are refered to. They act as
her compass at this point of her life when she is so overwhelmed by sadness and grief
and can't think straight. In times where she is "mad" as Jane herself says she is,
turning back to her set of values which she sees as being enshrined by God, provides her
with guidance so that she knows what she should do.