“What has been said in this chapter is preparatory to placing you in the hands of the Father, where you will have no more absolute need that will not be supplied by the Spirit; but remember that supply may often come to you through physical means, or through the mentality of other persons. But you cannot set up the idol in your heart as to how the things that you need shall come. God may use some low, even malicious person to teach you some great and grand truth. Remember always that it is the knowledge that you want, not the messenger! If God sends an important message to you by the hand of a devil, what concern is it to you? It is the message that you want. It is the knowledge that is useful to you, and if a messenger comes with knowledge that is not useful, that is not in harmony with the Divine Purpose, no matter if the messenger claims to be the angel of God, no matter if he comes in a flame of fire, reject the message.
Believe God and follow righteousness and all will be well. For, if you have lived the life up to this point, God will have fulfilled his part of the covenant, and you will realize that you have the spirit of truth and you will be able to discern between truth and error. Just so long as you are faithful to your part of the covenant, faithful in your devotion to God and Spirit, so long can you absolutely trust that Spirit of truth that will lead you into all truth, and enable you to reject all error, and will many times, even show you things to come.
The teachers in the church are ever warning their people against error, and frequently warning them against great and important truths as error, because the teachers do not believe God. But if you believe God, and trust him wholly, your eye will ever be single to the knowledge of the truth; not because you want this, that, or the other, but because you want only to know and to do the will. Then you will know within yourself. It will not be a belief, but God will make you know the truth.
But after you have been made to know the truth, if through fear or through any means whatever, you fail to follow it, to be led by it, then will the Spirit leave you to go your own way, until you repent and seek God with all your heart again, and find that peace and confidence which enable you to be obedient to the knowledge of the truth; then you will be made conscious again, that you have the guidance of the Spirit.”
Hiram Butler
The Mark Of God: Understanding Your "I AM Presence" 