Wisdom of Manoah

"Be penitent and for thy fault contrite,

But act not in my own affliction, Son,

Repent the sin, but if the punishment

Thou canst avoid, self-preservation bids;

Or th' execution leave to high disposal,

And let another hand, not thine, exact

the penal forfeit from thy self; perhaps

God will relent, and quit thee all his debt;

Who evermore approves and more accepts

(Best pleased with humble and filial submission)

Him who imploring mercy sues for life,

Then who self-rigorous chooses death as due;

Which argues over-just, and self-displeas'd

For self-offense, more then for God offended.

Reject not then what offerd means, who knows

But God hath sent before us (502-517)."

In this passage Manoah has come to his son pleading that Samson not give himself up for dead.  He wants his son to recognize that giving one's self over to God does not mean giving up.  Manoah argues that in repenting Samson may still preserve his own life; in the life he has left he may still please God and merit His mercy.  Do not act in your own affliction, others will do that for you, yet repent and live the life God still has given you.  Manoah tells Samson to put his life in his own hand's and his death in someone else's.  I wonder how the poem's ending relates to this wisdom.  Samson takes his life into his hands and dies by them as well.  Is this a vindication of Manoah's wisdom, and is that why he can rejoice at the end of the poem?  Is Manoah's wisdom an overarching theme of the poem?