Promises are like piecrust, made to be broken
promises are like pie crust(s): (they are) made to be broken
Promises are as thin and fragile as pie crust, and people make them so often but are rarely inclined to keep them. "Pie crust" is often written as a single word. A: "He promised to help me study for my exam, but he didn't show up!" B: "Well, promises are like pie crusts, Sarah—made to be broken." A: "I promise that I will never do something like that again." B: "Not good enough, Tom. Promises are like piecrust—they're made to be broken."
Promises are like piecrust, made to be broken.
Prov. It is useless to make promises, because people always break their promises. Lisa made Andrew promise not to drink anymore, but promises are like piecrust, made to be broken.