Which two sets of lines in this excerpt from Thomas Hardy's "The Darkling Thrush" signify hope in the midst of despair?

I leant upon a coppice gate
When Frost was spectre-gray,
[And Winter's dregs made desolate
The weakening eye of day.
The tangled bine-stems scored the sky]
Like strings of broken lyres,
[And all mankind that haunted nigh
Had sought their household fires.]

The land's sharp features seemed to be
The Century's corpse outleant,
His crypt the cloudy canopy,
The wind his death lament.
[The ancient pulse of germ and birth
Was shrunken hard and dry,]
And every spirit upon earth
Seemed fervourless as I.

[At once a voice arose among
The bleak twigs overhead
In a full-hearted evensong]
Of joy illimited;
[An aged thrust, frail, gaunt, and small,
In blast-beruffled plume,
Had chosen thus to fling his soul
Upon the growing gloom.]

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