Have you noticed that plants which creep in voluntarily are seldom a welcome addition? The vine that has wound itself around the grape vine on the dog yard fence is barely noticeable during spring and early summer. In the autumn, securely established and bearing fruit, it displays its scarlet foliage in plain view. I remember Mom pointing out the difference between its poisonous berries and the grapes. Over the years we've pulled out yards of that vine, but still have not succeeded in eradicating it.
In John 15:1 Jesus identified Himself as the true vine. In John 14:6 He said, "I am the way, the truth, and the life. No one comes to the Father except through Me." (NKJV) Without seeking them, suggestions of other paths to truth are presented to us. The One who is truth will not barge in uninvited. We read in Jeremiah 29:13, "you will seek Me and find Me, when you search for Me with all your heart." (NKJV)
In my search, John 7:17 got me on track. People in Jesus' day wanted to know, as we do, what was true. He gave them a way to test His teaching. If they chose to do God's will, they would know what was of God. It made no sense, but I cried out to God, "I don't know what Your will is, but I'm willing to do it and I want to know what is true." Since that time understanding of God and His ways has continued to be unfolded to me. He is true to His Word.
Like the vine that crept in among the grapes, other teachings may seem attractive but are not able to nourish. To seek out the true life-giving Vine is more than worth the effort.