Grumbling and complaining don’t have as much to do with what you are dealing with than the carnal nature in you. However thankfulness and contentment are fruits of the Spirit.

Scripture References:

Jude 1:14: These are grumblers, malcontents, following their own sinful desires…

Philippians 2:14-16: Do all things without grumbling or disputing, that you may be blameless and innocent, children of God without blemish in the midst of a crooked and twisted generation, among whom you shine as lights in the world, holding fast to the word of life, so that in the day of Christ I may be proud that I did not run in vain or labor in vain. 

Numbers 11:1 
And the people complained in the hearing of the Lord about their misfortunes, and when the Lord heard it, his anger was kindled, and the fire of the Lord burned among them and consumed some outlying parts of the camp.

Hebrews 13:5 
Keep your life free from love of money, and be content with what you have, for he has said, “I will never leave you nor forsake you.”

1st Thessalonians 5:16: Give thanks in all circumstances; for this is the will of God in Christ Jesus for you.

Proverbs 13:10: And we know that for those who love God all things work together for good, for those who are called according to his purpose. 

1 Thessalonians 5:16-18  
Rejoice always, pray without ceasing, give thanks in all circumstances; for this is the will of God in Christ Jesus for you.

Philippians 4:11
Not that I am speaking of being in need, for I have learned in whatever situation I am to be content.