A grateful mind By owing owes not, but still pays, at once Indebted and discharged; what burden then?

A grateful mind By owing owes not, but still pays, at once Indebted and discharged; what burden then?

感恩的心不欠别人的债，但仍会付出，既欠了又还清;负担什么?

-- John Milton 约翰·米尔顿