calculate consequences

If he had been of an impetuous disposition, he would have snatched the pitchfork from the ground and impaled this fraternal demon. But David was by no means impetuous; he was a young man greatly given to calculate consequences, a habit which has been held to be the foundation of virtue. But somehow it had not precisely that effect in David: he calculated whether an action would harm himself, or whether it would only harm other people. In the former case he was very timid about satisfying his immediate desires, but in the latter he would risk the result with much courage.
George Eliot, Brother Jacob