The Bible (et al) has a lot to say about the transience of wealth --- thieves, moths, rust --- riches becoming slippery that they can't be held --- that sort of thing.
Now, I don't want to be misinterpreted and have people thinking I'm judging others, but current events demonstrate just how slippery wealth can be. Viz:
...the fortunes of the 1,000 wealthiest people in the UK have fallen more than 50% from £412.8 billion in the list for 2008 to about £200 billion. The value of some assets, including hedge funds and property firms, has been shattered by as much as 90%. *
To say nothing of the schmucks with ridiculous mortgages. Or the poor folks who've had jobs evaporate.
Lay up for yourselves treasures in heaven.
This other stuff has a definite shelf life.