What did Charles Taze say about studying the bible without a WT publication?
"Furthermore, not only do we find that people cannot see the divine plan in studying the Bible by itself, but we see, also, that if anyone lays the SCRIPTURE STUDIES aside, even after he has used them, after he has become familiar with them, after he has read them for ten years - if he then lays them aside and ignores them and goes to the Bible alone, though he has understood his Bible for ten years, our experience shows that within two years he goes into darkness. On the other hand, if he had earnest heed to the opportunities for service and consider that merely read the SCRIPTURE STUDIES with their references, and had not read a page of the Bible, as such, he would be in the light at the end of the two years, because he would have the light of the Scriptures." Watchtower 1910 Sep 15 reprints p.344