How does William Blake personify innocence in "Holy Thursday" ?

The lines of children flow like the Thames;

"Till into the high dome of Pauls they like Thames waters flow."

Blake likens them to the flowers of London and to lambs;

"O what a multitude they seem’d these flowers of London town"

"The hum of multitudes was there but multitudes of lambs.."

Their voices are like the wind and harmonious thunder;

"Now like a mighty wind they raise to heaven the voice of song,

Or like harmonious thunderings the seats of heaven among..."

"Or like harmonious thunderings the seats of heaven among..."

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