<p>2:18 <i>And in the same manner you also should be glad and rejoice with me</i>- As explained on :16 and :17, Paul would rejoice eternally at the last day because of their salvation; but they were on track for salvation, and so Paul rejoiced even now. And he asks them to share that joy, as if they were in some unnecessary doubt about their salvation. There will be both now and eternally a mutuality in our joy. Joy in its true sense is not selfish; to rejoice regarding issues only pertinent to ourselves would surely be selfish.</p>