I should not dare to be so sad — Les Miserables

I should not dare to be so sad 1
So many Years again-
A Load is first impossible
When we have put it down-

The Superhuman then withdraws 5
And we who never saw
The Giant at the other side
Begin to perish now.
(F.1233/J.1197)
[1] I:: Cosette.
[2] sad, again:: sad for Jean Valjean who was ill and dying.
[3] Load, first impossible:: the escape of Cosette and Valjean.
[5] Superhuman:: Jean Valjean, who has the strength to lift a loaded cart. "He'd have to be devilish stout. And then he would risk getting crushed." withdraws:: after Cosette married Marius Pontmercy, Valjean stopped to protect them.
[7] Giant at the other side:: Valjean did not let them know he protected the couple.
[8] perish:: Valjean died of old age and illness.