"We again took the matter to the Lord in prayer. We knew that the mighty Healer could restore both my husband and me to health, if it was for His glory so to do. It seemed hard to move out, weary, sick, and discouraged; but at times I felt that God would make the journey a blessing to us both if we went trusting in Him. The thought would frequently arise in my mind: “Where is your faith? God has promised, ‘As thy days, so shall thy strength be.’” 4T 278.1"
"Confess your faults one to another, and pray one for another, that ye may be healed. The effectual fervent prayer of a righteous man availeth much."
EGW directly quotes the promise 'As thy days, so shall thy strength be,' connecting her situation to God's promise of strength in times of need, although the actual verse is Deuteronomy 33:25, not James 5:16. James 5:16 is about prayer for healing, which is a related but distinct concept.
"our journey. We both decided to walk out by faith and to venture all on the promises of God. This movement upon our part required considerable faith; but upon taking our seats in the cars, we felt that we were in the path of duty. We rested in traveling and slept well at night. 4T 278.2"
"Now faith is the substance of things hoped for, the evidence of things not seen."
Both passages emphasize acting in faith, even when the outcome is uncertain. EGW's decision to travel despite illness aligns with the concept of faith as 'the substance of things hoped for.'