"The Word of God Our Safeguard Our watchword is to be, “To the law and to the testimony: if they speak not according to this word, it is because there is no light in them.” [ Isaiah 8:20 .] We have a Bible full of the most precious truth. It contains the alpha and the omega of knowledge. The Scriptures, given by inspiration of God, are “profitable for doctrine, for reproof, for correction, for instruction in righteousness: that the man of God may be perfect, thoroughly furnished unto all good works.” [ 2 Timothy 3:16, 17 .] Take the Bible as your study-book. All can understand its instruction. GW 309"
"To the law and to the testimony: if they speak not according to this word, it is because there is no light in them."
Ellen White directly references Isaiah 8:20 in this passage.
"Christ calls upon His people to believe and practice His word. Those who receive and assimilate this word, making it a part of every action, of every attribute of character, will grow strong in the strength of God. It will be seen that their faith is of heavenly origin. They will not wander into strange paths. Their minds will not turn to a religion of sentimentalism and excitement. Before angels and before men, they will stand as those who have strong, consistent Christian characters. GW 309.2"
"If ye love me, keep my commandments."
Both passages connect obedience to God's word/commandments with spiritual growth and strength. EGW expands on the practical implications of keeping Christ's commandments.
"For as the body without the spirit is dead, so faith without works is dead also."
Both passages emphasize the importance of practical application of faith. James speaks of works, while EGW speaks of actions and character.
"In the golden censer of truth, as presented in Christ's teachings, we have that which will convict and convert souls. Proclaim, in the simplicity of Christ, the truths that He came to this world to proclaim, and the power of your message will make itself felt. Do not advocate theories or tests that Christ has never mentioned, and that have no foundation in the Bible. We have grand, solemn truths for the people. “It is written” is the test that must be brought home to every soul. GW 309.3"
"To the law and to the testimony: if they speak not according to this word, it is because there is no light in them."
Both passages emphasize the importance of grounding beliefs and teachings in scripture. EGW's "It is written" echoes Isaiah's call to the law and the testimony.
"And my speech and my preaching was not with enticing words of man’s wisdom, but in demonstration of the Spirit and of power:"
Both passages emphasize the importance of preaching with the power of the Spirit and not relying on human wisdom or enticing words. EGW focuses on the simplicity of Christ's teachings.