“Truth and Heresy” (1649) by Wesminster divine George Gillespie is an excellent piece warning about doctrinal compromise and deception. The following is an excerpt refuting the theological relativists of his time, who are not unlike those of today:
“Search the scriptures,” John 5:39; Acts 17:11. Do not take upon trust new lights from any man, be he never so eminent for parts or for grace, but to the law and the testimony.
The upshot of all is that we ought to hold fast the profession of our faith without wavering, and be steadfast, and even immovable in the truth, and not to give place to the adversaries, no, not for an hour, Gal. 2:4-5.