"There the redeemed shall know, even as also they are known. The loves and sympathies which God Himself has planted in the soul shall there find truest and sweetest exercise. The pure communion with holy beings, the harmonious social life with the blessed angels and with the faithful ones of all ages who have washed their robes and made them white in the blood of the Lamb, the sacred ties that bind together “the whole family in heaven and earth” ( Ephesians 3:15 )—these help to constitute the happiness of the redeemed. GC 677.1"
"Of whom the whole family in heaven and earth is named,"
Ellen White directly references Ephesians 3:15 in this passage.
"There, immortal minds will contemplate with never-failing delight the wonders of creative power, the mysteries of redeeming love. There will be no cruel, deceiving foe to tempt to forgetfulness of God. Every faculty will be developed, every capacity increased. The acquirement of knowledge will not weary the mind or exhaust the energies. There the grandest enterprises may be carried forward, the loftiest aspirations reached, the highest ambitions realized; and still there will arise new heights to surmount, new wonders to admire, new truths to comprehend, fresh objects to call forth the powers of mind and soul and body. GC 677.2"
"But as it is written, Eye hath not seen, nor ear heard, neither have entered into the heart of man, the things which God hath prepared for them that love him."
Both passages describe the wonders and joys of the afterlife. The EGW passage speaks of contemplating creative power and redeeming love, while the Bible verse suggests that the blessings God has prepared are beyond human comprehension.
"All the treasures of the universe will be open to the study of God's redeemed. Unfettered by mortality, they wing their tireless flight to worlds afar—worlds that thrilled with sorrow at the spectacle of human woe and rang with songs of gladness at the tidings of a ransomed soul. With unutterable delight the children of earth enter into the joy and the wisdom of unfallen beings. They share the treasures of knowledge and understanding gained through ages upon ages in contemplation of God's handiwork. With undimmed vision they gaze upon the glory of creation—suns and stars and systems, all in their appointed order circling the throne of Deity. Upon all things, from the least to the greatest, the Creator's name is written, and in all are the riches of His power displayed. GC 677.3"
"And God shall wipe away all tears from their eyes; and there shall be no more death, neither sorrow, nor crying, neither shall there be any more pain: for the former things are passed away."
While Revelation 21:4 focuses on the absence of suffering in the new earth, and the EGW passage focuses on the exploration of the universe, both describe aspects of the redeemed in a state free from the limitations and sorrows of the present world. The absence of sorrow allows for the joy and exploration described by EGW.
"For now we see through a glass, darkly; but then face to face: now I know in part; but then shall I know even as also I am known."
Both passages deal with increased knowledge and understanding in the afterlife. EGW expands on the idea of seeing more clearly and knowing more fully, which is present in 1 Corinthians 13:12.