What does Isaiah 49:21 mean?

Then shalt thou say in thy heart, Who hath begotten me these, seeing I have been bereaved of my children, and am solitary, an exile, and wandering to and fro? and who hath brought up these? Behold, I was left alone; these, where were they?

Then shalt thou say in thine heart, Who hath begotten me these, seeing I have lost my children, and am desolate, a captive, and removing to and fro? and who hath brought up these? Behold, I was left alone; these, where had they been?

Then shalt thou say in thy heart, Who hath begotten me these, seeing I have been bereaved of my children, and am solitary, an exile, and wandering to and fro? and who hath brought up these? Behold, I was left alone; these, where were they?

Then you will say in your heart, Who has given me all these children? when my children had been taken from me, and I was no longer able to have others, who took care of these? when I was by myself, where then were these?

And thou hast said in thy heart: `Who hath begotten for me--these? And I bereaved and gloomy, A captive, and turned aside, And these--who hath nourished? Lo, I--I was left by myself, these--whence <FI>are<Fi> they?

And thou shalt say in thy heart: Who hath begotten these? I was barren and brought not forth, led away, and captive: and who hath brought up these? I was destitute and alone: and these, where were they?

And thou shalt say in thy heart, Who hath borne me these, seeing I had lost my children and was desolate, an exile, and driven about? and who hath brought up these? behold, I was left alone; these, where were they?