John Calvin preaches about finding comfort and hope in the midst of loss, emphasizing that those who die in the Lord are blessed and find rest from their labors, with their works following them. He encourages the bereaved to trust in Christ's sovereignty over life and death, reminding them that those who belong to Christ are under His care. Calvin reassures that those who have passed away in Christ have reached maturity in the sight of the Lord and will be reunited with believers in the blessed resurrection in the kingdom of God.

And I heard a voice from heaven saying unto me, Write, Blessed are the dead which die in the Lord from henceforth: Yea, saith the Spirit, that they may rest from their labours; and their works do follow them. —Revelation 14:13 But what advantage, you will say, is it to me to have had a son of so much promise, since he has been torn away from me in the first flower of his youth? As if, indeed, Christ had not merited, by his death, the supreme dominion over the living and the dead! And if we belong to him (as we ought) why may he not exercise over us the power of life and of death? However brief, therefore, either in your opinion or in mine, the life of your son may have been, it ought to satisfy us that he has finished the course which the Lord has marked out for him. Moreover, we may not reckon him to have perished in the flower of his age who had grown ripe in the sight of the Lord. For I consider all to have arrived at maturity who are summoned away by death; unless, perhaps, one would contend with him, as if he can snatch away anyone before his time. This, indeed, holds true of everyone; but in regard to Louis, it is yet more certain on another and peculiar ground. For he had arrived at that age when, by true evidences, he could prove himself a member of the body of Christ: having put forth this fruit, he was taken from us and transplanted. Yes, instead of this transient and vanishing shadow of life, he has regained the real immortality of being. Nor can you consider yourself to have lost him, whom you will recover in the blessed resurrection in the kingdom of God. For they had both so lived and so died, that I cannot doubt but they are now with the Lord; let us, therefore, press forward toward this goal which they have reached. There can be no doubt but that Christ will bind together both them and us in the same inseparable society, in that incomparable participation of his own glory. Beware, therefore, that you do not lament your son as lost, whom you acknowledge to be preserved by the Lord, that he may remain yours for ever who, at the pleasure of his own will, lent him to you only for a season. Nor will you derive small consolation from this consideration, if you only weigh carefully what is left to you. Charles survives to you, of whom we all entertain this sentiment, that there is not one of us who does not desire that he might have such a son. Do not suppose that these expressions are only intended for your hearing, or that there is exaggeration here, in order to bespeak your favor. This is no more my habit than it is my disposition. —Correspondence