The theme of the Mass this week is reliance on Divine Providence, centering on the famous part of the Sermon on the Mount where Our Lord urges us not to worry about the basic necessities of life, but to trust in God (Gradual).
The selection of texts suggest that it is all about getting a proper sense of perspective by focusing on the Kingdom of God. The Introit sets up this theme by reminding us that God is our protector, and 'better is one day in thy courts above thousands...' Similarly, the Communio takes a line from the Gospel, and urges us to 'Seek first the Kingdom of God...'
The Epistle, from Galatians, provides a reminder that the Kingdom is already here in one sense, listing out the fruits of the Holy Spirit that are given to those who have conquered sin. As the Offertory says, 'Taste and see that the Lord is sweet'.
The Gospel though is surely one of the most beautiful of New Testament texts, filled with the memorable lines such as 'Consider the lilies of the field, how they grow: they labour not, neither do they spin...', and yet outdo even the magnificent robes of Solomon on his throne; and 'No man can serve two masters..'.