"For My people have committed two evils: 1.) They have forsaken Me, the "Fountain of living waters." 2.) They hewn themselves cisterns—broken cisterns that can hold no water." (Jeremiah 2:13) 

Who would set aside a flowing fountain or spring of fresh water for a cracked, broken cistern—a pit for collecting rainwater—that couldn't even hold the water? God told the Israelites they were doing that very thing when they turned from Him, the "Fountain of living waters," to worship idols. The people had built religious systems in which to store truth, but those systems were worthless.

Why should we cling to the broken promises of unstable "cisterns" (money, power, fame, religious systems, or whatever transitory thing we are choosing in place of God) when God promises to constantly refresh us with Himself, the Living Water (John 4:10)?