It means like don't over use it or don't under use it. Use it for when you need it and when its important rather then use it for something that doesn't matter.
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I can try and help I need the questions though
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They think that Betty has been bewitched so if she really was she would not be able to survive hearing the Lord's name. More likely the reason was that she heard everything about the affair between John Proctor and Abby.
