This saying is just another way of saying, be careful what you do and say, because eventually those things will come around to bite you in the butt, or the old saying "What goes around, comes around". Another old saying is "Cast your bread on the water and it will come back to you pressed down, shaken together and running over." Well just be careful that bread isn't moldy and rotten because you'll get that back in droves. So it's best to learn to treat other's as you would like them to treat you. I don't really see what is not to understand in Dorena's statement, and I see nothing nefarious in it because it is a simple and age old reality.
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