"If your life is hid with Christ in God, a divine Helper will stand beside you, and you will be one with the Saviour and one with those you are teaching. Never exalt self; exalt Christ, glorify Him, honor Him before the world. Say, I stand under the bloodstained banner of Prince Immanuel. I am wholly on the Lord's side. Show sympathy and tenderness in dealing with your pupils. Reveal the love of God. Let the words you speak be kind and encouraging. Then as you work for your students, what a transformation will be wrought in the characters of those who have not been properly trained in the home! The Lord can make even youthful teachers channels for the revealing of His grace, if they will consecrate themselves to Him. CT 152.1"
"For ye are dead, and your life is hid with Christ in God."
The EGW passage directly references and expands upon the concept of being 'hid with Christ in God' from Colossians 3:3. It connects this spiritual state with the ability to be a divine helper and to exalt Christ in teaching.