“All the forms of error, I say, whatever department of the Christian system they may have been supposed to attack—have really stabbed at the Deity of our Redeemer.

That is the one thing that they are angry at, as if their mother-wit taught them it was the true line of demarcation between natural and revealed religion. They cannot bear that the glorious Lord should be unto us a place of broad rivers and streams, and so they fly to do without Him.

But their tacklings are loosed, they cannot well strengthen their mast, they cannot spread the sail. A Gospel without belief in the living and true God—Trinity in Unity, and Unity in Trinity—is a rope of sand. As well hope to make a pyramid stand upon its apex as to make a substantial Gospel when the real and Personal Deity of the Father, the Son, and the Holy Spirit is left as a moot or disputed point.”

- CH Spurgeon, “The Root of The Matter”.