What is the use of a sheaf of regrets?

What is the use of a garland of sighs?

Ah! but philosophy always forgets—

Writ though the sentence, and cast though the dies—

Love may fly downward from God’s parapets,

Fanning Eternity’s breath as she flies!

Groundlings awake from their squalor and rise,

Destiny then may well gather her debts—

What is the use of a garland of sighs?

What is the use of a sheaf of regrets?