How does Milton resolve that problem in the sestet (last six lines)? His soul "soon replies" that he will be able to see his wife again in the afterlife.
Milton reassures himself that other people have worse burdens to bear than his "mild yoke."
Patience reassures him that even those "who stand and wait" are serving God.

Atahualpaemperor of the inca empire who rose to the throne after winning a civil war between him and his brother.  -he refused to become a spanish vassal or christian.-francisco pizarro kidnapped him and demanded a huge ransom.  -pizarro's secretary described him as "a man of thirty years, good-looking and poised, somewhat stout, with a wide, handsome, and ferocious face, and the eyes flaming with blood."-after the ransom was paid, atahualpa was killed by pizarro