"As your soul yearns after God, you will find more and still more of the unsearchable riches of His grace. As you contemplate these riches you will come into possession of them and will reveal the merits of the Saviour's sacrifice, the protection of His righteousness, the fullness of His wisdom, and His power to present you before the Father “without spot, and blameless.” 2 Peter 3:14 . AA 567.1"
"Wherefore, beloved, seeing that ye look for such things, be diligent that ye may be found of him in peace, without spot, and blameless."
Ellen White directly references 2 Peter 3:14 in this passage.
"Unto me, who am less than the least of all saints, is this grace given, that I should preach among the Gentiles the unsearchable riches of Christ;"
Both passages discuss the 'unsearchable riches' of Christ/grace. While the context differs slightly (preaching to Gentiles vs. personal experience), the shared phrase and concept create a strong thematic link.
"In the body of his flesh through death, to present you holy and unblameable and unreproveable in his sight:"
The phrase 'without spot, and blameless' in the EGW quote is a direct allusion to the concept of being presented holy and unblameable before God, as described in Colossians 1:22 and 2 Peter 3:14. The EGW passage is clearly drawing upon this biblical idea.