2 Samuel i. 25, 26

Some tears fell down my cheeks and then I smiled,
As those smile who have no face in the world
To smile back to them. I had lost a friend.

Mrs Browning

Forgive my grief for one removed,
Thy creature, whom I found so fair.
I trust he lives in thee, and there
I find him worthier to be loved.

Tennyson

To wail friends lost
Is not by much so wholesome—profitable,
As to rejoice at friends but newly found.

Shakespeare

That aching of the breast, the grandest pain that man endures, which no other can assuage.

Henry D. Thoreau