A little good is soon spent.

A small supply of something useful or beneficial, such as money or practical help, can be used up quickly. The saying stresses how little protection a modest reserve provides against continuing needs or expenses.

It can also warn against treating a limited advantage as though it will last. What seems helpful at first may make only a brief difference when demands exceed the available supply.

Use it when a small amount of money, assistance, or another practical benefit disappears rapidly because needs continue. It is a cautionary observation about inadequate reserves, not praise of thrift or a claim that help has no value.