A good test of whether or not someone is of God is by his actions. Jesus' actions were so miraculous and overwhelmingly consistent with God's Word that any reservations about whether or not He was of God should have been set aside. 

But, in Mark 7:13, they had exalted their own traditions above God's Word, making the Word of God of no effect in their own lives. As in this instance nearly two thousand years ago, theologians now are sometimes the last to accept a move of God if it violates their traditional beliefs. "The common people heard him gladly" (Mark 12:37). "Knowledge puffeth up, but charity edifieth" (1 Corinthians  8:1).

In spiritual matters, a person can educate himself in theology to the degree that it does more harm than good. It is possible to win a theological battle and yet lose the war for a person's heart. Arguments over points of theology often distract from the more important issues. There is no premium on ignorance, but love is infinitely superior to knowledge. We should learn all we can, but we must make our knowledge a servant to love. "The greatest of these is love" (1 Corinthians 13:13).

If anyone's quest for knowledge leads them away from knowing God, then it would have been preferable for them to stay ignorant. What we know is not as important as who we know (speaking of the Lord). Our most important goal in life must be to love God and be known of Him.