What does this quote mean from Shakespeare's metamorphoses poem?

Dismiss your vows, your feigned tears, your flattery;

For where a heart is hard they make no battery.

Also if any of you guys know the story of Adonis and Venus, how would you describe Adonis and Venus's character ? Who is victim? why? interpretation into modern day love? etc. I'm curious.
What does this quote mean from Shakespeare's metamorphoses poem?
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