2 Samuel 13:36 And it came to pass, as soon as he had made an end of speaking, that, behold, the king’s sons came, and lifted up their voice and wept: and the king also and all his servants wept very sore.
David and his household heard the bad news of the murder of Amnon and the flight of Absalom. This message brought sorrow and grief to the king’s sons and servants; and they all wept and mourned together. David’s family may have been dysfunctional, but they were still family, along with his servants. The whole household would weep with those who weep. Weeping with one another doesn’t really take away the grief and loss, but some comfort comes from sharing the sorrow and mourning together.
Weeping and mourning is the natural response to sin, death, and loss. The Self lost something, which brings grief, but love grieves with the sufferer and gives some comfort.
A part of the cause of weeping is that we have lost someone, but the unseen and greater cause of weeping is that we are aggrieved over Sin, sin in the world and our own sin, that brings death, loss, and misery. Jesus wept at the tomb of Lazarus, not just because of the loss of a friend, but mainly because of Sin that causes death, pain, and loss. But then Jesus responded by doing something about it: He raised Lazarus and went on to die for the sins of all, and then rise to give victory over tears.
Therefore, in heaven God Himself will wipe away all tears, for sin, death, and loss will be no more. Then we shall rejoice with those who rejoice.