"I cannot express to you the intense desire of my soul that you should all seek the Lord most earnestly while he may be found. We are in the day of God's preparation. Let nothing be regarded as of sufficient worth to draw your minds from the work of preparing for the great day of Judgment. Get ready. Let not cold unbelief hold your souls away from God; but let his love burn on the altar of your hearts.— “Testimony,” No. 33, pp. 117, 118. CE 248.1"
"Seek ye the Lord while he may be found, call ye upon him while he is near:"
The EGW passage directly quotes and expands upon Isaiah 55:6, urging readers to seek the Lord while He may be found. The phrase 'while he may be found' is a clear and direct allusion.