"“The word has gone forth to Europe, ‘Go forward!’ The humblest toiler for the salvation of souls is a laborer together with God, a coworker with Christ. Angels minister unto him. As we advance in the opening path of His providence, God will continue to open the way before us. The greater the difficulties to be overcome, the greater will be the victory gained.” The Review and Herald, December 6, 1887 . LS 307.1"
"For we are labourers together with God: ye are God’s husbandry, ye are God’s building."
The phrase "laborer together with God" is a direct quote or very close paraphrase of 1 Corinthians 3:9, making this an explicit allusion.
"Are they not all ministering spirits, sent forth to minister for them who shall be heirs of salvation?"
Both passages discuss the role of angels in ministering to believers. Hebrews 1:14 explicitly states that angels are ministering spirits, and EGW mentions that angels minister to those toiling for the salvation of souls.