Divine.

And as for the vague something --- was it a sinister or a sorrowful, a designing or a desponding expression? --- that opened upon a careful observer, now and then, in his eye, and closed again before one could fathom the strange depth partially disclosed; that something which used to make me fear and shrink, as if I had been wandering amongst volcanic-looking hills, and had suddenly felt the ground quiver, and seen it gape: that something, I, at intervals, beheld still; and with throbbing heart, but not with palsied nerves. Instead of wishing to shun, I longed only to dare --- to divine it.

Charlotte Brontë