Sentence:  But when we come to a fine thing in our own language--to a stanza from Shelley's "Adonais" for instance: He has outsoared the shadow of our night; Envy and calumny and hate and pain, And that unrest which men miscall delight, Can touch him not and torture not again; From the contagion of the world's slow stain He is secure, and now can never mourn A heart grown cold, a head grown gray in vain; Nor, when the spirit's self has ceased to burn, With <WSD>sparkless</WSD> ashes load an unlamented urn. what can you do with "that"? 
Meaning of the word marked with <WSD> tags:  without a spark