Whosoever transgresseth, and abideth not in the doctrine of Christ, hath not God. He that abideth in the doctrine of Christ, he hath both the Father and the Son. – 2 John 1:9

Alas! we have, in some quarters, too much of faith trusted in which is not practical. Men say they believe, but they do not prove it by their lives. They remain in sin, and yet wrap themselves up in the belief that they are God’s chosen ones. From such turn away, and remember that a faith without works is dead, and only the faith that changes the character, sanctifies the life, and leads the man to God, is the faith which will save the soul. We must see to it that in our doctrine we bow our judgment to the teachings of Scripture, and try to be conformed to all the revelation of God, and especially to all the teachings of our Lord Jesus Christ. Scylla is there and Charybdis is there, and he is a happy helmsman who can steer between the two. You shall fall into this ism or into that, unless you keep to the truth. Never mind whether you can make the truth always consistent to your own judgment or not. If it is the truth, believe it; and though it should seem to contradict another truth, yet hold to it, if it is in the Word, waiting till clearer light shall reveal to you that all these truths stood in a wonderful harmony and consistency which, at first, you could not perceive. In doctrine, buy the truth.~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/3449.cfm