My God will supply every need of yours according to his riches in glory in Christ Jesus. Paul writes this from prison. Not from abundance but from experience. God's provision does not come according to your merit but according to his riches.
In the New Covenant, provision is not your struggle but his promise. That does not mean you do nothing. It means the source stands firm even when the path is unclear.
Rest arises when you know: the source is inexhaustible. Not because you have enough but because he is enough.