The wise counsel of the Pharisee Gamaliel should be considered by many. The counsel was trying their best to cause harm to Peter and John for preaching in the temple but they did not stop it. Their work was from Yahweh and not from man. The same is applicable today. You can test the fruit of someone's works and if it is not of Yahweh, it will be evident in due time.
"...And now I say to you, keep away from these men and let them alone; for if this plan or this work is of men, it will come to nothing; but if it is of God, you cannot overthrow it—lest you even be found to fight against God."
http://bible.com/114/act.5.38-39.nkjv
Be Blessed.
Antoine E. Hall
