"When we seek for appropriate language in which to describe the love of God, we find words too tame, too weak, too far beneath the theme, and we lay down our pen and say, “No, it cannot be described.” We can only do as did the beloved disciple, and say, “Behold, what manner of love the Father hath bestowed upon us, that we should be called the sons of God.” [ 1 John 3:1 .] In attempting any description of this love, we feel that we are as infants lisping their first words. Silently we may adore; for silence in this matter is the only eloquence. This love is past all language to describe. It is the mystery of God in the flesh, God in Christ, and divinity in humanity. Christ bowed down in unparalleled humility, that in his exaltation to the throne of God, he might also exalt those who believe in him, to a seat with him upon his throne. All who look upon Jesus in faith that the wounds and bruises that sin has made will be healed in him, shall be made whole. CE 77.1"
"Behold, what manner of love the Father hath bestowed upon us, that we should be called the sons of God: therefore the world knoweth us not, because it knew him not."
EGW directly quotes 1 John 3:1 and builds her argument about the indescribable nature of God's love around it.
The themes of redemption are momentous themes, and only those who are spiritually minded can discern their depth and significance. It is our safety, our life, our joy, to dwell upon the truths of the plan of salvation. Faith and prayer are necessary in order that we may behold the deep things of God. Our minds are so bound about with narrow ideas, that we catch but limited views of the experience it is our privilege to have. How little do we comprehend what is meant by the prayer of the apostle, when he says, “That he would grant you, according to the riches of his glory, to be strengthened with might by his spirit in the inner man; that Christ may dwell in your hearts by faith; that ye, being rooted and grounded in love, may be able to comprehend with all saints what is the breadth, and length, and depth, and height, and to know the love of Christ, which passeth knowledge, that ye might be filled with all the fullness of God. Now unto him that is able to do exceeding abundantly above …
"That he would grant you, according to the riches of his glory, to be strengthened with might by his Spirit in the inner man; That Christ may dwell in your hearts by faith; that ye, being rooted and grounded in love, May be able to comprehend with all saints what is the breadth, and length, and depth, and height; And to know the love of Christ, which passeth knowledge, that ye might be filled with all the fulness of God. Now unto him that is able to do exceeding abundantly above all that we ask or think, according to the power that worketh in us, Unto him be glory in the church by Christ Jesus throughout all ages, world without end. Amen."
Ellen White directly references Ephesians 3:16-21 in this passage.
"But God hath revealed them unto us by his Spirit: for the Spirit searcheth all things, yea, the deep things of God."
While EGW doesn't directly quote 1 Corinthians 2:10, she discusses the need for spiritual discernment to understand the 'deep things of God,' which aligns with the verse's assertion that the Spirit reveals these deep things.