The seal of the living God will be placed upon those only who bear a likeness to Christ in character. SDA Bible Commentary 7:970.

As wax takes the impression of the seal, so the soul is to take the impression of the Spirit of God and retain the image of Christ. SDA Bible Commentary 7:970.

It is obedience to the principles of the commandments of God, that molds the character after the divine similitude. Sons and Daughters of God, 52.

The seal of God's law is found in the fourth commandment. This only, of all the ten, brings to view both the name and the title of the Lawgiver. It declares Him to be the Creator of the heavens and the earth, and thus shows His claim to reverence and worship above all others. Aside from this precept, there is nothing in the Decalogue to show by whose authority the law is given. The Signs of the Times, June 14, 1910 (The Great Controversy, 452).

The Israelites placed over their doors a signature of blood, to show that they were God's property. So the children of God in this age will bear the signature God has appointed. They will place themselves in harmony with God's holy law. A mark is placed upon every one of God's people just as verily as a mark was placed over the doors of the Hebrew dwellings, to preserve the people from the general ruin. God declares, “I gave them my sabbaths, to be a sign between me and them, that they might know that I am the Lord that sanctify them.” Ezekiel 20:12. SDA Bible Commentary 7:968, 969.

Just as soon as the people of God are sealed in their foreheads—it is not any seal or mark that can be seen, but a settling into the truth, both intellectually and spiritually, so they cannot be moved—just as soon as God's people are sealed and prepared for the shaking, it will come. Indeed, it has begun already; the judgments of God are now upon the land, to give us warning, that we may know what is coming. SDA Bible Commentary 4:1161.

Note: In some areas phrases have been omitted by the compilers for whatever reason. I have restored them as underlined text, that the full intent of the author may be given.