The power of the first two messages to be concentrated in the third—The first and second angels’ messages are bound up with the third angel’s message. The power of the proclamation of the first and second angels’ messages are to be concentrated in the third.—Letter 209, 1899 (December 19) 3AM 39.4
The messages are to be blended—The first, second, and third angels’ messages are to blend as a complete whole. This message is not to lose its force or power, but is to increase in intensity under the movings of the Holy Spirit, until the whole earth is filled with its light and power.—Letter 157, 1899 (October 11) 3AM 40.1
The messages cannot be separated—These messages are connected and bound together. One cannot be carried without the other.—Letter 65, 1897 (April 6) 3AM 40.2
A threefold light to the world—The three angels’ messages are to be combined, giving their threefold light to the world.—Manuscript 52, 1900 (February 28) (Seventh-day Adventist Bible Commentary, Ellen White Comments 7:985) 3AM 40.3
All three messages to be combined—The first and the second angels’ messages are of great importance and are followed by the third angel’s message. All three should be understood and combined. The warning contained in these messages means much more to the whole world than the majority of God’s people comprehend. We are in the Lord’s great day of preparation.—Manuscript 124, 1901 (December 9) 3AM 40.4
The power of the first two messages multiplied—The third angel’s message multiplies the power of the first and second, for all are to be given in unity, the church below uniting with the universe of heaven in sounding forth not only the third angel’s message, but the first and the second, glorifying God in doing a great work in the earth, in proclaiming the truth. The Lord is coming the second time with power and great glory. This grand work for the Master requires entire consecration to God.—Letter 1a, 1895 (January 17) 3AM 40.5