As I said, I don't like trying to analyze the lexico-grammatical aspects of poetry, but your thread seems to be slipping away, Jobb. 'Stop and start' I suppose refers ('its') to the heart, so-- the ending and beginning of love, hope, etc, the emotions with which the heart is concerned. 'Will chime you change and hours'-- 'chime' is ring like a clock, hence 'announce', the changes and passing hours of your life.
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