The words, emptied from vessel to vessel, are so suggestive! The Holy Spirit in making use of such an expression means more than we may think from a surface or careless reading. The figure has to do with wine-making. It tells one of the methods used in producing a clear, rich, well-refined wine. It is poured into a vessel and allowed to stand for a certain length of time under respective circumstances perhaps of heat, cold, light of darkness. Then it is poured again into another.