God created Reason, and it was the most beautiful being in his creation: and God said to it, “I have not created anything better or more perfect or more beautiful than thou: blessings will come down on mankind on thy account, and they will be judged according to the use they make of thee.”

Muhammad (570-632) Arabian merchant, prophet, founder of Islam [Mohammed]

Hadith
    (Source)

In Syed Ameer Ali, A Critical Examination of the Life and Teachings of Mohammed (1873), cited to The Kitâb-ul-Mustarif, ch. 2, and The Mishkât, Bk 22, ch. 18, pt. 3 (from Abu Hurairah)