This is why Paul resolved to know nothing else but Jesus Christ and Him crucified (1 Cor. 2:2):
There is a way of “doctoring” the gospel in much the same manner. A little truth is given up, and then a little more, and men fill up the vacuum with opinions, inferences, speculations, and dreams, till their wine is mixed with water, and the water none of the best. Many preachers—and I speak it with sorrow—have built a tower of theological speculations, upon which they sit, like Nero, fiddling the tune of their own philosophy while the world is burning with sin and misery. They are playing with the toys of speculations while men’s souls are being lost.
C.H. Spurgeon (An All-Round Ministry: Addresses to Ministers and Students, 10-11)