How do we know a doctrine is true?

To ascertain if a doctrine is true, we must test the spirits according to 1 John 4:1, which states, 'Beloved, believe not every spirit, but try the spirits whether they are of God.' This approach requires believers to be vigilant and discerning, listening attentively to what is preached, ensuring it aligns with the truth of Scripture. The true message of the gospel should always center on Christ, His grace, and His finished work. Any doctrine that omits Christ or adds human prerequisites for salvation must be considered suspect.