"“Some, I was shown, could receive the published visions, judging of the tree by its fruits. Others are like doubting Thomas; they cannot believe the published Testimonies , nor receive evidence through the testimony of others, but must see and have the evidence for themselves. Such must not be set aside, but long patience and brotherly love should be exercised toward them until they find their position and become established for or against. If they fight against the visions, of which they have no knowledge; if they carry their opposition so far as to oppose that in which they have had no experience, ... the church may know that they are not right.” [ Testimonies for the Church 1:328 (1862) .] 5T 668.2"
"The other disciples therefore said unto him, We have seen the Lord. But he said unto them, Except I shall see in his hands the print of the nails, and put my finger into the print of the nails, and thrust my hand into his side, I will not believe."
The EGW passage explicitly references the story of doubting Thomas and uses it as an analogy for those who struggle to believe the testimonies without personal experience.