343. Should Christians be concerned with material things?

No, they shouldn't be.

Therefore take no thought, saying, What shall we eat? or, What shall we drink? or, Wherewithal shall we be clothed? ... Take therefore no thought for the morrow. Matthew 6:31, 34

Yes, they should be.

But if any provide not for his own house, he hath denied the faith, and is worse than an infidel. 1 Timothy 5:8