Book II, 71: On KAIN and DAVID

Their Sins were equall; Equall was their guilt:
They both committed Homicide; Both spilt
Their Brothers guiltles blood: Nay, of the twayne,
The first occasion was lesse foule, in Kain:
'Twas likely Kains Murther was in heate
Of blood; There was no former grudge, no threate:
But Davids was a Plott; He tooke the life
Of poore Vriah, to enjoy his Wife:
Was Iustice equall? Was her Ballance even?
Kain was punisht: David was forgiven:
Both came to tryall: But good David did
Confesse that Sin, which cursed Kain hid:
Kain bewaild the punishment; wherein,
His Sin had plung'd him: David wayles his Sin:
If I lament my sins; Thou wilt forbeare
To punish, Lord; or give me strength, to beare.