Surah 89. Al-Fajr, Ayah 16

I.e., he regards the absence or loss of affluence not as a trial, but as an evidence of divine "injustice" - which, in its turn, may lead to a denial of God's existence.

Subsistence, in both the literal and the figurative sense. Allah provides for all, but people complain if the provision is measured and restricted to their needs, circumstances, and antecedents, and does not come up to their desires or expectations, or is different from that given to people in quite different circumstances.