I remember hearing many times from the platform, and especially the assemblies, that we had to give our valuable things to Jehovah till it hurt - and if it didn't hurt, we weren't struggling enough.
Especially contributions - did we give till we hurt or did we give out of our surplus? They love to use the example of the widow's mite to guilt us.
One CO said that "some people only give Jehovah 10 hours a month!" - can you imagine that? What about all the hours spent studying and attending meetings?