The definition of “sealed” or to seal up, in this instance, means to close and make fast with a seal, or signet, items such as books, letters, etc., so they would not be read. It is also used in the sense of setting a mark on anything, or a seal, to denote that it is genuine, authentic, confirmed, or approved, as when a deed, contract, or agreement is sealed. “Sealed” can also be applied to persons, denoting that they are approved, as in Rev 7:3: “Do not harm the earth or the sea or the trees, until we have sealed the servants of our God on their foreheads.” Nothing was to be injured until the angel should designate the true servants of God.
Those who are sealed have been bought with a great price. It is wonderful that God thought it worth His while to expend so much on us! We cannot suppose that He will not make all He can of us! He will bring His estate under cultivation. There will be no corner of it that will not yield Him produce. Our Lord wills each of us to be active and diligent in the employment where He places us. It is also His will that this employment and all the concerns of daily life should be subservient to the interest of the soul.