Meanings are contained in forms, forms reflect larger structures.
Language structures integrate into categories, and here are just a few of them.
The vocativus is supposed to invoke in vain.
The partitivus is in order to secede.
The præpositionalis is to erase from memory.
The instrumentalis is meant to manipulate.
The translativus is for losing oneself.
The accusativus is in order to condemn.
The caritivus because dreams don't come true.
The exspectativus denotes that time is an abstraction.
The locativus to stay put.
There are no superfluous cases.