Already we begin to see that the glory that we encounter in our daily lives is not very positive.
The glory of Our Lord is His Incarnation: this is His impact on Time and Space. It is this glory we mst seek first. In putting God first, we shew forth our worship of Him. In order to worship God, we must seek first the Kingdom of God and His righteousness. In so doing, we get a promise. All that we need, what we desire most, will be given to us in God. God knows our needs, He can supply our needs and He wants to supply our needs. And we will have our needs met by seeking Him.
This is why Mass is one of the highest expressions of worship that there are. For here we seek God's very presence. The One who says "Seek ye first" is here for us to seek and to draw into ourselves. We may still worry about tomorrow but, by allowing that earworm to continue, we can be assured that, in our search, today will fall into place and tomorrow will as well. Sufficient unto the day is the evil thereof. Sufficient unto all eternity is God's love.