"When the law was given, Israel, degraded by the long bondage in Egypt, had need to be impressed with the power and majesty of God; yet He revealed Himself to them no less as a God of love. MB 45.2"
"And it came to pass on the third day in the morning, that there were thunders and lightnings, and a thick cloud upon the mount, and the voice of the trumpet exceeding loud; so that all the people that was in the camp trembled."
The EGW passage refers to the giving of the law and God's power and majesty, while also mentioning His love. Exodus 19:16 describes the dramatic scene at Mount Sinai when the law was given, emphasizing God's power and majesty. While not a direct quote, the EGW passage amplifies the context and purpose behind the events described in Exodus.
"“The Lord came from Sinai, And rose from Seir unto them; He shined forth from Mount Paran, And He came from the ten thousands of holy ones: At His right hand was a fiery law unto them. Yea, He loveth the tribes; All their holy ones are in Thy hand: And they sat down at Thy feet; Everyone received of Thy words.” Deuteronomy 33:2, 3 , R.V., margin. MB 45.3"
"And he said, The Lord came from Sinai, and rose up from Seir unto them; he shined forth from mount Paran, and he came with ten thousands of saints: from his right hand went a fiery law for them."
The EGW passage directly quotes Deuteronomy 33:2.