Elisha used salt to heal the waters of Jericho, which in turn healed the city’s barren land. 
Salt is ordinary. It is common. It is readily available. But once God ordained it as his tool to heal the land and Elisha followed God’s plan of using it, it took on an entirely new value and worth. The ordinary, common, abundant commodity became the very tool that God used to glorify himself and affect an entire group of people. 
When you are willing to use what God has given you to work for him, your gift, no matter how common or ordinary it may seem, can be used by God to work miracles in your life and those around you. 
Scripture taken from: II Kings 2:19-22