"So He gave them what they wanted, but He allowed their souls to become weak because of it". (Psalm 106:15) NLV.
Christians who complain about their circumstances would do well to ponder this sobering verse and its background. God had greatly blessed His people, Israel, delivering them supernaturally from slavery in Egypt, protecting them against their enemies—even miraculously supplying daily bread and water for them in the desert.
Still they complained—about their food, about the imaginary luxuries they had left behind in Egypt, and against their leaders:
"Soon the people began to complain about their hardship, and the Lord heard everything they said. Then the Lord’s anger blazed against them, and he sent a fire to rage among them, and he destroyed some of the people in the outskirts of the camp". (Numbers 11:1) NLT.
Finally, when they complained about the manna, “the Lord’s anger blazed against them", He sent them quail to eat in such abundance as to last even "an entire month", "you will eat it a whole month until it comes out of your nose and you hate it, because you have turned away from the Lord Who is among you". Then, "While the meat was still between their teeth and not yet eaten, the Lord became angry with the people. The Lord sent a bad sickness upon the people". (Numbers 11:10, 20, 33). NLV.
God has blessed every Christian with forgiveness of sin and eternal life. He daily fulfills His promise to supply every need (not every desire, however), and we should live a thankful life in return, regardless of our particular lot in this world:
"In everything give thanks. This is what God wants you to do because of Christ Jesus". (1 Thessalonians 5:18). NLV.
"Keep your lives free from the love of money. Be happy with what you have. God has said, “I will never leave you or let you be alone.” (Hebrews 13:5) NLV.
"Be glad you can do the things you should be doing. Do all things without arguing and talking about how you wish you did not have to do them". (Philippians 2:14). NLV.
Complaining about what we don’t have may well result in God taking away what we do have—and still worse, allowing our souls to become weak.