And In Whatsoever You Differ, The Decision Thereof Is With Allaah
In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Allaah (The Most High) said:
وَمَا اخْتَلَفْتُمْ فِيهِ مِنْ شَيْءٍ فَحُكْمُهُ إِلَى اللَّهِ
”And in whatsoever you differ, the decision thereof is with Allah (He is the ruling Judge).” 
Imaam Ibnul Qayyim (rahimaahullaah) said:
This is a clear text regarding the fact that the judgement for all our differing is to be referred back to Allaah alone. He is the Judge in this (affair) through the speech of His Messenger (sallal-laahu-alayhi-wasallam). If you were to give precedence to the intellect over Allaah’s Judgement, then you are not (considered as) one who judges by Allaah’s Revelation and His Book.
 Qur’aan. 42:10
 As-Sawaa’iq Al-Mursalah 3/828. See here; Ruling by other than the Sharee’ah: http://www.salafipublications.com/sps/sp.cfm?subsecID=MNJ05&articleID=MNJ050003&articlePages=1