"I commit this to you, hoping and praying that God may bless it to you, and that you both may obtain a fitness to be counted worthy of eternal life. 1T 712.1"
"Which is a manifest token of the righteous judgment of God, that ye may be counted worthy of the kingdom of God, for which ye also suffer:"
The phrase 'counted worthy' is directly taken from 2 Thessalonians 1:5, and the context of eternal life/kingdom of God is also shared. EGW's statement is clearly alluding to this verse.