For just as the soul's reflection on itself is necessarily accompanied by mental joy or sadness and then by sensible joy or sadness when in the performance of its duty and in its submission to God's commands it realizes that it is in its proper state, or when giving way to its passions it is affected by the remorse that informs it that it is in an improper state so the flow of spirits excited for the good of the body is accompanied by sensible joy or sadness and then by mental joy or sadness, depending on whether the flow of animal spirits is hindered or encouraged by the will.