I see here a parallel between Jeremiah's sash and the belt of truth in Ephesians 6. We cannot afford to hide the truth! If we do, it will become unprofitable. This is in direct opposition to Paul's definition of Scripture in II Timothy 3:16-17. We must allow the Truth to be apparent (like a big belt) to those around us. Also II Corinthians 3:1-3.
Jeremiah intercedes for the land during a great drought. Without Jesus, that's all life is—a great drought. We see the Water finally come to this dry and weary land in John 4. Consider the lack of grass in Jeremiah 14:4-6. Right after Jesus describes Himself as living water, He says that the harvest is white and ripe, ready for a bountiful harvest (John 4:35). Contrast Jeremiah 14:3 with John 4:28. The nobles' lads returned with empty buckets, but the woman at the well was so completely satisfied after meeting Jesus that she left her bucket behind. Jesus is our unending supply of thirst-quenching living water!!