Thus, while the church receives and gives its seal of approval to the Scriptures, it does not thereby render authentic what is otherwise doubtful or controversial. But because the church recognizes Scripture to be the truth of its own God, as a pious duty it unhesitatingly venerates Scripture. As to their question—How can we be assured that this has sprung from God unless we have recourse to the decree of the church?—it is as if someone asked: Whence will we learn to distinguish light from darkness, white from black, sweet from bitter? Indeed, Scripture exhibits fully as clear evidence of its own truth as while and black things do of their color, or sweet and bitter things do of their taste

John Calvin, Institutes I.VII.2