God said He would take care of all our needs. Seek the Kingdom of God above all else, and live righteously, and he will give you everything you need. (Mat 6:33) Part of living righteously is having an attitude of thankfulness.
If someone gives you a hundred dollars, you would probably thank them. If you had a mother like mine, you would sit down and write a thank you card immediately. But what if you were told, you’ll get the hundred dollars later? A thankful heart would show gratitude now, before the money came.
Trusting God with all your heart, is really believing that He will be there for you when you need Him. If you know He’s taking care of you, then be grateful for what you haven’t seen yet. Thankfulness opens doors to provision. If you need a lot, imagine that big answer coming to you and thank Him with as much excitement as when you finally see it happen.
Thankfulness allows you to live joyfully because you know that God is faithful to His word and you never have to stress. When you can put your trust in Him, you can finally relax and be excited for your future, not afraid of what might happen. God is good and has your life in His hands. Thank Him for that.
Another post on thankfulness: The Secret Power of Thank You