"In the precepts of His holy law, God has given a perfect rule of life; and He has declared that until the close of time this law, unchanged in a single jot or tittle, is to maintain its claim upon human beings. Christ came to magnify the law and make it honorable. He showed that it is based upon the broad foundation of love to God and love to man, and that obedience to its precepts comprises the whole duty of man. In His own life He gave an example of obedience to the law of God. In the Sermon on the Mount He showed how its requirements extend beyond the outward acts and take cognizance of the thoughts and intents of the heart. AA 505.1"
"Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil."
The EGW passage directly echoes and expands upon Matthew 5:17, emphasizing Christ's fulfillment and magnification of the law. The connection is strong and explicit.
"Let us hear the conclusion of the whole matter: Fear God, and keep his commandments: for this is the whole duty of man."
Both passages discuss the duty of man in relation to God's commandments. While not a direct quote, the thematic overlap is significant.
"Ye have heard that it was said by them of old time, Thou shalt not kill; and whosoever shall kill shall be in danger of the judgment: But I say unto you, That whosoever is angry with his brother without a cause shall be in danger of the judgment: and whosoever shall say to his brother, Raca, shall be in danger of the council: but whosoever shall say, Thou fool, shall be in danger of hell fire."
The EGW passage refers to the Sermon on the Mount and the extension of the law's requirements to thoughts and intents. Matthew 5:21-22 is a specific example of this extension, making the connection valid.
"The law, obeyed, leads men to deny “ungodliness and worldly lusts,” and to “live soberly, righteously, and godly, in this present world.” Titus 2:12 . But the enemy of all righteousness has taken the world captive and has led men and women to disobey the law. As Paul foresaw, multitudes have turned from the plain, searching truths of God's word and have chosen teachers who present to them the fables they desire. Many among both ministers and people are trampling under their feet the commandments of God. Thus the Creator of the world is insulted, and Satan laughs in triumph at the success of his devices. AA 505.2"
"Teaching us that, denying ungodliness and worldly lusts, we should live soberly, righteously, and godly, in this present world;"
Ellen White directly references Titus 2:12 in this passage.
"For the time will come when they will not endure sound doctrine; but after their own lusts shall they heap to themselves teachers, having itching ears;"
The EGW passage directly references Titus 2:12 and then connects the disobedience to the law with people choosing teachers who present fables, which is the core idea of 2 Timothy 4:3.