Jesus Forbids Sectarianism

John said unto him, Teacher, we saw one casting out demons in thy name; and we forbade him, because he followed not us. But Jesus said, Forbid him not: for there is no man who shall do a mighty work in my name, and be able quickly to speak evil of me. For he that is not against us is for us. For whosoever shall give you a cup of water to drink, because ye are Christ's, verily I say unto you, he shall in no wise lose his reward.

Mark 9:38-41
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Jesus told him, "I am the way, the truth, and the life. No one can come to the Father except through me." (John 14:6)