1. Revelation 21:4 (ESV)
  2. Exposition

Why are mourning and crying and pain also mentioned?

Revelation 21:4 (ESV)

4 He will wipe away every tear from their eyes, and death shall be no more, neither shall there be mourning, nor crying, nor pain anymore, for the former things have passed away.”

These three are of one piece inasmuch as they capture the emotive response to death. With death gone, these emotive responses (which themselves trigger the tears mentioned earlier) are gone also. Everything that takes away the bliss and pleasure of God living with people is taken away.