Every doctrine is to be tested by the Sacred Word. If any belief does not stand this test, it is of darkness and not of light. TOJ 70.6
“However much one may advance in spiritual life, he will never come to a point where he will not need diligently to search the Scriptures; for therein are found the evidences of our faith. All points of doctrine, even though they have been accepted as truth, should be brought to the law and to the testimony; if they cannot stand this test, ‘there is no light in them.’”—Testimonies for the Church 5:575 TOJ 70.7
“Do not make the Sabbath school lessons dry and spiritless. Leave the impression upon the mind that the Bible, and the Bible alone, is our rule of faith, and that the sayings and doings of men are not to be a criterion for our doctrines or actions.”—Testimonies on Sabbath School Work, p. 32. TOJ 71.1
“The Bible is our rule of faith and doctrine. There is nothing more calculated to energize the mind and strengthen the intellect than the study of the Word of God. No other book is so potent to elevate the thoughts or give vigor to the faculties, as the broad, ennobling truths of the Bible. If God’s Word were studied as it should be, men would have a breadth of mind, a nobility of character, and a stability of purpose that are rarely seen in these times.”—Gospel Workers, 249. TOJ 71.2