2 Corinthians 1:14
As also ye have acknowledged us in part, that we are your rejoicing, even as ye also are ours in the day of the Lord Jesus. As also ye have acknowledged us in part, that we are your rejoicing, even as ye also are ours in the day of the Lord Jesus.
The verse teaches mutual rejoicing: those who received the good news will be the cause for rejoicing of the one who brought it, just as he and his companions are their cause for rejoicing, acknowledged in part now and recognized in its fullness in the day of the Lord Jesus. That shared joy is set for the day of the Lord Jesus, which is Christ's coming at the end of this age. It is the termination of the day of salvation, the end in view.
The joy in that day will consist in seeing those for whom one has labored saved with an everlasting salvation in the kingdom of God, with mutual rejoicing in heaven between workers and converts. The joy in the kingdom will be to see those whom God blessed the labor to bring into the truth, ministers and those they brought into the truth being a mutual rejoicing. That meeting in glory includes those for whom believers labored and prayed but never saw in this life. Their shared rejoicing in that day shows that the faithful minister and those saved through his work will know one another in the heavenly state, the people who received the ministry being his joy when Christ comes just as he and his fellow workers were theirs.
That day is when the truth's work of sanctifying and saving people is fulfilled. It is the time when believers may be accepted and rejoice in one another, with that shared joy reaching its fulfillment. Those who abide in Christ and help bring souls to him will have them as a crown of rejoicing on that day. This hope belongs to those who heed the warning, are tested by the truth, and remain faithful to God's commandments and the faith of Jesus, for whom many souls are hoped to be saved for that day.
It is right and as it should be to esteem very highly for their work's sake those who first brought the truth. Letting personal feeling grow into partiality replaces the disinterested benevolence essential to Christianity with selfishness.