"The Higher Course “Since the beginning of the world men have not...perceived by the ear, neither hath the eyes seen,...what He hath prepared for him that waiteth for Him.” Chapter 35—The School of the Hereafter Ed 301 “They shall see His face; and His name shall be in their foreheads.” Heaven is a school; its field of study, the universe; its teacher, the Infinite One. A branch of this school was established in Eden; and, the plan of redemption accomplished, education will again be taken up in the Eden school. Ed 299"
"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."
EGW directly quotes 1 Corinthians 2:9.
"And they shall see his face; and his name shall be in their foreheads."
EGW directly quotes Revelation 22:4.
"For since the beginning of the world men have not heard, nor perceived by the ear, neither hath the eye seen, O God, beside thee, what he hath prepared for him that waiteth for him."
EGW is alluding to Isaiah 64:4, although she quotes 1 Corinthians 2:9. The Isaiah passage is the original source of the sentiment.