"If the man who feels that he is called of God to be a minister will humble himself and learn of Christ, he will become a true teacher. What we need in our camp meetings is a ministry vivified by the Holy Spirit. There must be less sermonizing and more tact to educate the people in practical religion. They must be impressed with the fact that Christ is salvation to all who believe. “God so loved the world, that He gave His only-begotten Son, that whosoever believeth in Him should not perish, but have everlasting life.” John 3:16 . There are grand themes on which the gospel minister may dwell. Christ has said: “He that believeth on Me hath everlasting life.” John 6:47 . 6T 88.2"
"For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life."
The EGW passage directly quotes John 3:16, making it an explicit allusion.
"Verily, verily, I say unto you, He that believeth on me hath everlasting life."
Ellen White directly references John 6:47 in this passage.
"If the minister's lips are touched with a coal from off the altar, he will lift up Jesus as the sinner's only hope. When the heart of the speaker is sanctified through the truth, his words will be living realities to himself and to others. Those who hear him will know that he has been with God and has drawn near to Him in fervent, effectual prayer. The Holy Spirit has fallen upon him, his soul has felt the vital, heavenly fire, and he will be able to compare spiritual things with spiritual. Power will be given him to tear down the strongholds of Satan. Hearts will be broken by his presentation of the love of God, and many will inquire: “What must I do to be saved?” 6T 88.3"
"Then flew one of the seraphims unto me, having a live coal in his hand, which he had taken with the tongs from off the altar: And he laid it upon my mouth, and said, Lo, this hath touched thy lips; and thine iniquity is taken away, and thy sin purged."
The EGW passage explicitly refers to the imagery of a 'coal from off the altar' touching the lips, which is a direct reference to Isaiah 6:6-7. The context of purification and empowerment for speaking God's word is also present in both passages.