"The Corinthian believers, once so prone to lose sight of their high calling in Christ, had developed strength of Christian character. Their words and acts revealed the transforming power of the grace of God, and they were now a strong force for good in that center of heathenism and superstition. In the society of his beloved companions and these faithful converts the apostle's worn and troubled spirit found rest. AA 372.2"
"Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new."
The EGW passage describes the transformation of the Corinthian believers and their changed character, directly reflecting the principle of being a 'new creature' in Christ as stated in 2 Corinthians 5:17.