the voice of reason

• The King must listen to the voice of reason in his Parliament and dismiss his fat-witted advisors!
  يجب أن ينصت الملك لصوت العقل في برلمانه ويقيل مستشاريه الجشعين
• I can't believe I'm the one who's the voice of reason here. But...are you sure you want to do that?
  لا أصدق أني صوت المنطق هنا لكن هل أنتم متأكدون من فعل هذا؟