سُبْحَانَ ٱللَّٰهِ
Holy Qur'an
Al-Qur'an
Kids Qur'an
I.e., God's bestowal of blessings is not just a "reward" of righteousness but, rather, a test of man's remaining conscious of, and therefore grateful to, Him.
Meaning, to see if they will be grateful to Allah for rain and other provisions.
To remember Allah is to realise His presence, acknowledge Iiis Goodness, and accept His guidance. If we fail to do so, by deliberately turning away, He will withdraw His Grace, and that will be a severe Penalty indeed.