When a wine maker makes wine, he pours the first batch into another bottle and what is left in the bottle is a lot slush at the bottle that he can't use. He continues this process several times and each time he pours the wine into another bottle there is less slush and the wine has a better scent and a better taste, and he will do this several more times until he produce a perfect wine. So it is with us. God wants to empty us out. He wants to get the slush or the things that He can't use out of us , and keep pruning us through His word until He gets the perfected us that He can use which will then make us fit for the Master's use.