These things have I spoken unto you, being yet present with you. – John 14:25

We sometimes see posthumous children, that is, those who are born after the father is deceased; and there is generally much sorrow mingled with the thought of such births, for the poor widow’s heart is doubly troubled by the extra care needed for the little stranger who arrives after the bread-winner of the family is taken away. But if a man is the means of bringing another to Christ after he himself is dead, there need be no sorrow about that matter. There have been many, many instances in which earnest Christian people have sought the conversion of their relatives or friends; they have prayed for them, and wept over them, and pleaded with them, but all their efforts have been unsuccessful; yet, after their death, the memory of their holy zeal has touched the conscience of the one who would not yield before, and brought him to Christ…When I am taken away, I can but wish that any true and faithful word that I have spoken may still continue to speak to you from my grave. When good Mr. Payson died, he begged that his people might come and see him, if they wished, before he was interred; and those who did so read these words on his bosom, “Remember the word which I have spoken unto you being yet present with you.” It was thus his desire, you see, that he should have posthumous spiritual children, that they should be born to God even though they should seem to be “born out of due time.” Ah! you wives, who have been praying for your husbands these many years, never give them up, because they may be brought to Christ when you yourselves will be in heaven. Mothers and fathers, never cease pleading for your children, for they, too, may be brought to Jesus when you are among the angels…Persevere in prayer, you who are seeking the salvation of others. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2663.cfm