Reply to Objection 2: As stated above (Q[31], A[8]), one pleasure hinders another; and yet every pleasure assuages sorrow. Consequently it is not unreasonable that sorrow should be assuaged by causes which hinder one another.
Reply to Objection 3: Every good disposition of the body reacts somewhat on the heart, which is the beginning and end of bodily movements, as stated in De Causa Mot. Animal. xi.