"Yet God accomplished His own beneficent purpose in permitting the warning of the judgment to be given just as it was. The great day was at hand, and in His providence the people were brought to the test of a definite time, in order to reveal to them what was in their hearts. The message was designed for the testing and purification of the church. They were to be led to see whether their affections were set upon this world or upon Christ and heaven. They professed to love the Saviour; now they were to prove their love. Were they ready to renounce their worldly hopes and ambitions, and welcome with joy the advent of their Lord? The message was designed to enable them to discern their true spiritual state; it was sent in mercy to arouse them to seek the Lord with repentance and humiliation. GC 353.1"
"And thou shalt remember all the way which the Lord thy God led thee these forty years in the wilderness, to humble thee, and to prove thee, to know what was in thine heart, whether thou wouldest keep his commandments, or no."
Both passages describe a period of testing designed to reveal the true state of people's hearts and their commitment to God. Deuteronomy 8:2 refers to the testing of the Israelites in the wilderness, while the EGW passage refers to the testing of believers through the message of the imminent judgment.
"The disappointment also, though the result of their own misapprehension of the message which they gave, was to be overruled for good. It would test the hearts of those who had professed to receive the warning. In the face of their disappointment would they rashly give up their experience and cast away their confidence in God's word? or would they, in prayer and humility, seek to discern where they had failed to comprehend the significance of the prophecy? How many had moved from fear, or from impulse and excitement? How many were halfhearted and unbelieving? Multitudes professed to love the appearing of the Lord. When called to endure the scoffs and reproach of the world, and the test of delay and disappointment, would they renounce the faith? Because they did not immediately understand the dealings of God with them, would they cast aside truths sustained by the clearest testimony of His word? GC 353.2"
"For there must be also heresies among you, that they which are approved may be made manifest among you."
Both passages discuss how trials and disagreements can reveal the true character and faith of individuals within a religious community. 1 Cor 11:19 speaks of heresies revealing those who are approved, while the EGW passage speaks of disappointment testing the faith of believers.