Endeavoring to lay aside all preconceived opinions, and dispensing with commentaries, he compared scripture with scripture by the aid of the marginal references and the concordance. He pursued his study in a regular and methodical manner; beginning with Genesis, and reading verse by verse, he proceeded no faster than the meaning of the several passages so unfolded as to leave him free from all embarrassment. When he found anything obscure, it was his custom to compare it with every other text which seemed to have any reference to the matter under consideration. Every word was permitted to have its proper bearing upon the subject of the text, and if his view of it harmonized with every collateral passage, it ceased to be a difficulty. Thus whenever he met with a passage hard to be understood he found an explanation in some other portion of the Scriptures. As he studied with earnest prayer for divine enlightenment, that which had before appeared dark to his understanding was made clear. …
"The entrance of thy words giveth light; it giveth understanding unto the simple."
Ellen White directly references Psalms 119:130 in this passage.