If He said He would supply all our needs, why is there so much worry about money?
Firstly, we must agree with God that He is the source of all things. If we work and are paid for the work, there is a principle to be understood - to all labor there is a reward. Still, the source of the money is the Lord and not the job. This is heaven's perspective on money.
Secondly, few believers are faithful to pray in their "daily bread." This is critical because we see the things we bring to Him in prayer. No prayer, no sight. No sight, no peace.
If we think we are responsible for bringing in the provision, we can't be thankful.
Soldier of The Cross, every molecule of air is provided by Grace. So is every tiny portion of money. The Believer can not see anything but self-sufficiency unless there is dependent prayer.
Learn to lean.