The following is from Emma, and I'm wondering whether there is a disconnection here; the preposition for seems to lack an object, and "thinks strongly and clearly" seems out of place, grammatically.
No doubt he is a sensible man, and I suppose may have a natural talent for—thinks strongly and clearly—and when he takes a pen in hand, his thoughts naturally find proper words. It is so with some men. Yes, I understand the sort of mind. Vigorous, decided, with sentiments to a certain point, not coarse. A better written letter, Harriet (returning it,) than I had expected.”