I can think of few things more appropriate for Flag Day than Red Skelton’s immortal explanation of the Pledge of Allegiance. When my sainted mother became a naturalized American citizen, she was given a little American flag. I have a treasured photo of my Mom and Dad just after the naturalization ceremony, both happy, and my Mom clutching the flag of a land that she loved long before she became a citizen. I still have the flag, one of my most precious mementoes of my Mom.
A flag of course is only physically a piece of fabric, sometimes described disparagingly by cynics as a rag on a stick.  Sir Walter Scott described such people well long ago:
Breathes there the man with soul so dead,
Who never to himself hath said, Â
 ‘This is my own, my native land!’ Â
Whose heart hath ne’er within him burn’d
As home his footsteps he hath turn’d
From wandering on a foreign strand?
If such there breathe, go, mark him well;
For him no Minstrel raptures swell;
High though his titles, proud his name,
Boundless his wealth as wish can claim;
Despite those titles, power, and pelf,
The wretch, concentred all in self, Â
Living, shall forfeit fair renown, Â
And, doubly dying, shall go down
 To the vile dust from whence he sprung,
Unwept, unhonour’d, and unsung.
A flag is a symbol of the love and pride of a people in their nation. Those who disparage such sentiments are to be pitied rather than cursed.
Thank you.