If you give up your demands for more possessions and material matters, you will save yourself much needless sadness.

Sadness does not come from lacking possessions, but from your "lack of acceptance" at not having them.

Next time, when you are unable to acquire something, accept that you do not have it -- and avoid adding emotional pain to your practical problem of not having that thing.

Should you avoid material possessions? No. Just don't make oneself sad about those things you do not have.