What is the idea itself? We know about the idea of "missing the mark," and that we're imperfect, so then what does being perfect mean? Does it mean you would always hit the bullseye in archery? That of course says nothing about what kind of person someone is does it?
If it's about things like love and what's in someones heart, then thought and behavioral control is really superficial isn't it? This is the only point I'm making here, but it's plenty. Just look at how often things are focused on belief (thought control) and works, that should put it into perspective for any honest person.