What foolishness, therefore, to be concerned about eating and drinking; to be full of hesitation and doubt, to look anxiously for help, like the mariner in a tempest-tossed vessel! These all are things which the people of the world, the heathen, make their prime concern; but as for you, the Father knows that ye need these things. Only one thing there is which should be the object of anxious search, that is the kingdom of God. To be a member of this kingdom, to have and keep true faith in the heart, through which such membership is [ensured], that is the one fact which should give every Christian his chief concern, on account of which he daily prays the Second Petition. All the other things that are necessary for the sustaining of life are added without worry or care, by the providence of God.
—Paul E. Kretzmann, on Luke 12:27–31, hyperlink and “ensured” added