"Chapter 22—Prophecies Fulfilled When the time passed at which the Lord's coming was first expected,—in the spring of 1844,—those who had looked in faith for His appearing were for a season involved in doubt and uncertainty. While the world regarded them as having been utterly defeated and proved to have been cherishing a delusion, their source of consolation was still the word of God. Many continued to search the Scriptures, examining anew the evidences of their faith and carefully studying the prophecies to obtain further light. The Bible testimony in support of their position seemed clear and conclusive. Signs which could not be mistaken pointed to the coming of Christ as near. The special blessing of the Lord, both in the conversion of sinners and the revival of spiritual life among Christians, had testified that the message was of Heaven. And though the believers could not explain their disappointment, they felt assured that God had led them in their past experience. GC 391"
"And he said unto me, Unto two thousand and three hundred days; then shall the sanctuary be cleansed."
The EGW passage describes the disappointment of the Millerites after the expected return of Christ in 1844 and their subsequent study of prophecy. Daniel 8:14, which speaks of the cleansing of the sanctuary after 2300 days, was a key text in their calculations and subsequent re-evaluation. The connection is thematic in that both passages deal with prophetic interpretation and its implications.
"Interwoven with prophecies which they had regarded as applying to the time of the second advent was instruction specially adapted to their state of uncertainty and suspense, and encouraging them to wait patiently in the faith that what was now dark to their understanding would in due time be made plain. GC 391.2"
"For the vision is yet for an appointed time, but at the end it shall speak, and not lie: though it tarry, wait for it; because it will surely come, it will not tarry."
Both passages address the concept of waiting patiently for the fulfillment of prophecy, even when it seems delayed or unclear. Habakkuk 2:3 encourages waiting for the vision, while the EGW passage speaks of instruction encouraging believers to wait patiently in faith during a time of uncertainty.