"“From the time that we stepped on board the train, I felt perfectly satisfied that I was in the way of duty. I have had sweet communion with my Saviour, and have felt that He is my refuge and my fortress, and that no harm can come to me while engaged in the work which He has given me to do. I have an abiding trust in the promises of God, and enjoy that peace which comes only from Jesus.... LS 268.4"
"I will say of the Lord, He is my refuge and my fortress: my God; in him will I trust."
The EGW passage explicitly uses the phrase "my refuge and my fortress" which is directly quoted from Psalm 91:2, indicating a clear allusion.