Read Proverbs 11:1  Back in Bible times the farmers at the market had a balance scale that they used to weigh out their vegetables.  A balance scale is a bar with a balancing rope in the middle with pans hanging down on each side.  When the pans are both empty, the bar is balanced.  The farmer had a one pound weight on one side and would then put vegetables on the other side until the scale again balanced.  Then the farmer and the buyer would know there was one pound of vegetables of the other end of the scale.  But if the farmer was a cheater, he might drill out the bottom of his one pound weight and make it lighter.  The buyer might think that he was buying a pound of vegetables, but he was actually getting less than a pound.  He was paying for a pound of vegetables, but was not getting what he was paying for.  He was being cheated by the unjust weight.  Unless the buyer carried around their own weights to check the weights of the farmers, they would never know that they were being cheated.  But God knew!  He saw the cheating farmer.  God knows everything!  And He keeps a record of every deed - good and bad.  God delights in just weights.  God likes honesty.