The brilliance of the gospel light is dimmed by error. The clearness of the testimony is spoiled when doubtful voices are scattered among the people, and those who ought to preach the truth, the whole truth, and nothing but the truth, are telling out for doctrines the imaginations of men, and the inventions of the age.

Instead of revelation, we have philosophy, falsely so-called; instead of divine infallibility, we have surmises and larger hopes. The gospel of Jesus Christ, which is the same yesterday, to-day, and for ever, is taught as the production of progress, a growth, a thing to be amended and corrected year by year. It is an ill day, both for the church and the world, when the trumpet does not give a certain sound; for who shall prepare himself for the battle? (Online source)

Charles Spurgeon