Interesting how this little promise finds it's way in the same passage in which Jesus tells us not to worry about what to eat or drink or wear but to seek His kingdom, considering the birds and the lilies that are taken care of without much toil on their part.
When we do that He assures everything else will be given also.
Our Father has desired to give us the kingdom!
The question is are we seeking His kingdom?
What do we treasure in our lives?