Add thou not unto his words, lest he reprove thee, and thou be found a liar. Add not thou unto his words - You can no more increase their value by any addition, than you can that of gold by adding any other metal to it. Take care that you do not any thing that this word forbids, nor leave undone any thing that it commands: for this is adding and diminishing in Scripture phrase.
Lest he reprove thee - Lest he try thy word by fire, as his has been tried; and it appear that, far from abiding the test, the fire shows thine to be reprobate silver; and so thou be found a falsifier of God's word, and a liar.
How amply has this been fulfilled in the case of the Romish Church! It has added all the gross stuff in the Apocrypha, besides innumerable legends and traditions, to the word of God! They have been tried by the refiner's fire. And this Church has been reproved, and found to be a liar, in attempting to filiate on the most holy God spurious writings discreditable to his nature.