"Every human tie may perish, Friend to friend unfaithful prove, Mothers cease their own to cherish, Heaven and earth at last remove; But no changes Can attend Jehovah's love. 4T 330.1"
"For the mountains shall depart, and the hills be removed; but my kindness shall not depart from thee, neither shall the covenant of my peace be removed, saith the Lord that hath mercy on thee."
Both passages emphasize the enduring nature of God's love and faithfulness in contrast to the transient nature of earthly things. The EGW passage is a poetic expression of the same theme found in Isaiah 54:10.
"Not one of this family has had a religious experience that would qualify him to take any leading position in teaching the truth to others. “Be ye clean, that bear the vessels of the Lord,” were the words spoken by the angel of God. “Ye are not chosen vessels of God to do any part of His most sacred work. Ye mar and corrode, but do not purify and bless.” You have, Brethren B, ever held a low standard of Christianity. For a time, where you are not fully known, you have influence. This once gained, you become less guarded and act out the natural propensities of the heart, until the lovers of the truth feel that you are a great hindrance to the advancement of the work of God. This is no evil surmising, but the actual facts in the case. 4T 330.4"
"Depart ye, depart ye, go ye out from thence, touch no unclean thing; go ye out of the midst of her; be ye clean, that bear the vessels of the Lord."
EGW directly quotes Isaiah 52:11. The context is also similar, referring to purity and holiness in service to God.