Many think that they must consult commentaries on the Scriptures in order to understand the meaning of the word of God, and we would not take the position that commentaries should not be studied; but it will take much discernment to discover the truth of God under the mass of the words of men. How little has been done by the church as a body professing to believe the Bible, to gather up the scattered jewels of God's word into one perfect chain of truth? The jewels of truth do not lie upon the surface, as many suppose. The master mind in the confederacy of evil is ever at work to keep the truth out of sight, and to bring into full view the opinions of great men. The enemy is doing all in his power to obscure heaven's light through educational processes; for he does not mean that men shall hear the voice of the Lord, saying, “This is the way, walk ye in it.” [ Isaiah 30:21 .] CE 85.2 The jewels of truth lie scattered over the field of revelation; but they have been buried beneath human t…
"And thine ears shall hear a word behind thee, saying, This is the way, walk ye in it, when ye turn to the right hand, and when ye turn to the left."
Ellen White directly references Isaiah 30:21 in this passage.
"If thou seekest her as silver, and searchest for her as for hid treasures;"
While not a direct quote, the idea of searching for truth as one would search for hidden jewels or treasures aligns with the sentiment expressed in Proverbs 2:4. EGW uses the metaphor of 'scattered jewels' to describe the truths within God's word, which requires diligent searching to uncover.