In other words, God is our source.
But seek(aim at and strive after first of all His kingdom and His righteousness (His way of doing and being right), and then all these things taken together will be given you besides. Matt. 6:33.
Once we realize God has a storehouse of good things laid up for us and we decide to plant ourselves firmly in His kingdom so that we qualify for those blessing, then we understand that Matt. 6:33 is the key to Heaven's storehouse.