By touching upon man's need to eat and cloth himself, our Lord shows that all men need the salvation of the Savior, else they cannot be saved. Clothing our nakedness and eating by the sweat of our brow became a thing in our Fall in Adam, when all were made Sinners. Christ uses earthly examples, but he's speaking of heavenly things we need. We may trust the Lord wholly to provide what basic things we need. Let our focus be set upon seeking Christ, for he is the one thing needful.