“In our flag the barriers of time and space vanish. All America that ever was and ever will be lives every moment in our flag. Wherever in the world two or three of us stand together under our flag, all America is there.”

Address on the Flag of India (22 July 1947), as recorded in the Constituent Assembly Of India Vol. IV http://parliamentofindia.nic.in/ls/debates/vol4p7.htm
Context: The Flag links up the past and the present. It is the legacy bequeathed to us by the architects of our liberty. Those who fought under this Flag are mainly responsible for the arrival of this great day of Independence for India. Pandit Jawaharlal has pointed out to you that it is not a day of joy unmixed with sorrow. The Congress fought for unity and liberty. The unity has been compromised; liberty too. I feel, has been compromised, unless we are able to face the tasks which now confront us with courage, strength and vision. What is essential to-day is to equip ourselves with new strength and with new character if these difficulties are to be overcome and if the country is to achieve the great ideal of unity and liberty which it fought for. Times are hard. Everywhere we are consumed by phantasies. Our minds are haunted by myths. The world is full of misunderstandings, suspicions and distrusts. In these difficult days it depends on us under what banner we fight.
Here we are Putting in the very centre the white, the white of the Sun's rays. The white means the path of light. There is darkness even at noon as some People have urged, but it is necessary for us to dissipate these clouds of darkness and control our conduct-by the ideal light, the light of truth, of transparent simplicity which is illustrated by the colour of white.
We cannot attain purity, we cannot gain our goal of truth, unless we walk in the path of virtue. The Asoka's wheel represents to us the wheel of the Law, the wheel Dharma. Truth can be gained only by the pursuit of the path of Dharma, by the practice of virtue. Truth,—Satya, Dharma —Virtue, these ought to be the controlling principles of all those who work under this Flag. It also tells us that the Dharma is something which is perpetually moving. If this country has suffered in the recent past, it is due to our resistance to change. There are ever so many challenges hurled at us and if we have not got the courage and the strength to move along with the times, we will be left behind. There are ever so many institutions which are worked into our social fabric like caste and untouchability. Unless these things are scrapped we cannot say that we either seek truth or practise virtue. This wheel which is a rotating thing, which is a perpetually revolving thing, indicates to us that there is death in stagnation. There is life in movement. Our Dharma is Sanatana, eternal, not in the sense that it is a fixed deposit but in the sense that it is perpetually changing. Its uninterrupted continuity is its Sanatana character. So even with regard to our social conditions it is essential for us to move forward.
The red, the orange, the Bhagwa colour, represents the spirit of renunciation. All forms of renunciation are to be embodied in Raja Dharma. Philosophers must be kings. Our leaders must be disinterested. They must be dedicated spirits. They must be people who are imbued with the spirit of renunciation which that saffron, colour has transmitted to us from the beginning of our history. That stands for the fact that the World belongs not to the wealthy, not to the prosperous but to the meek and the humble, the dedicated and the detached.
That spirit of detachment that spirit of renunciation is represented by the orange or the saffron colour and Mahatma Gandhi has embodied it for us in his life and the Congress has worked under his guidance and with his message. If we are not imbued with that spirit of renunciation in than difficult days, we will again go under.
The green is there, our relation to the soil, our relation to the plant life here, on which all other life depends. We must build our Paradise, here on this green earth. If we are to succeed in this enterprise, we must be guided by truth (white), practise virtue (wheel), adopt the method of self-control and renunciation (saffron). This flag tells us "Be ever alert, be ever on the move, go forward, work for a free, flexible, compassionate, decent, democratic society in which Christians, Sikhs, Muslims, Hindus, Buddhists will all find a safe shelter." Let us all unite under this banner and rededicate ourselves to the ideas our flag symbolizes.

1870s, Letter to war veterans (1875)

Source: The Sand Pebbles (1962), Ch. 5; speech of Lt. Collins
Context: Civilians are only morally bound to salute our flag. We are legally bound. All Americans are morally bound to die for our flag, if called upon. Only we are legally bound. Only we live our lives in a day to day readiness for that sacrifice. We have sworn our oaths and cut our ties. We have given up wealth and home life, except as San Pablo is our home. It marks us. It sets us apart. We are uncomfortable reminders, in time of peace. Those of you who served in the last war know what I mean.

We don't need to give away flags for our fans to wave (2012)

Source: The Sand Pebbles (1962), Ch. 5; speech of Lt. Collins, the commander of the San Pablo to his crew at the start of summer cruising on the Yangtze River
Context: "Tomorrow we begin our summer cruising to show the flag on Tungting lake and the Hunan rivers," he said. "At home in America, when today reaches them, it will be Flag Day. They will gather to do honor and hear speeches. For us who wear the uniform, every day is Flag Day. We pay our honor in act and feeling and we have little need of words. But on this one day it will not hurt us to grasp briefly in words the meaning of our flag. That is what I want to talk about this morning.
"Our flag is the symbol of America. I want you to grasp what America really is," Lt. Collins said, nodding for emphasis. "It is more than marks on a map. It is more than buildings and land. America is a living structure of human lives, of all the American lives that ever were and ever will be. We in San Pablo are collectively only a tiny, momentary bit of that structure. How can we, standing here, grasp the whole of America?" He made a grasping motion. "Think now of a great cable," he said, and made a circle with his arms. "The cable has no natural limiting length. It can be spun out forever. We can unlay it into ropes, and the ropes, into strands, and the strands into yarns, and none of them have any natural ending. But now let us pull a yarn apart into single fibers —" he made plucking motions with his fingers " — and each man of us can find himself. Each fiber is a tiny, flat, yellowish thing, a foot or a yard long by nature. One American life from birth to death is like a single fiber. Each one is spun into the yarn of a family and the strand of a home town and the rope of a home state. The states are spun into the great, unending, unbreakable cable that is America."
His voice deepened on the last words. He paused, to let them think about it....
"No man, not even President Coolidge, can experience the whole of America directly," Lt. Collins resumed. "We can only feel it when the strain comes on, the terrible strain of hauling our history into a stormy future. Then the cable springs taut and vibrant. It thins and groans as the water squeezes out and all the fibers press each to each in iron hardness. Even then, we know only the fibers that press against us. But there is another way to know America."
He paused for a deep breath. The ranks were very quiet.
"We can know America through our flag which is its symbol," he said quietly. "In our flag the barriers of time and space vanish. All America that ever was and ever will be lives every moment in our flag. Wherever in the world two or three of us stand together under our flag, all America is there. When we stand proudly and salute our flag, that is what we know wordlessly in the passing moment....
"Understand that our flag is not the cloth but the pattern of form and color manifested in the cloth," Lt. Collins was saying. "It could have been any pattern once, but our fathers chose that one. History has made it sacred. The honor paid it in uncounted acts of individual reverence has made it live. Every morning in American schoolrooms children present their hearts to our flag. Every morning and evening we render it our military salutes. And so the pattern lives and it can manifest itself in any number of bits of perishable cloth, but the pattern is indestructible."

Old England is our Home, reported in Bartlett's Familiar Quotations, 10th ed. (1919).

1990s, Letter to Patrick Leahy (1999)

http://www.paulglover.org/9103.html (Ithaca Times, letter to editor), March 1991
Context: “War fans spit on the principles of the American Revolution when they charge obediently wherever their president points our flag.  Many flag-wavers know little about the U. S. Constitution, but can explain soap operas and football in detail.”

Many variants of this exist, but the earliest known incident of such a comment appears to be a partial quote from James Waterman Wise, Jr., reported in a 1936 issue of The Christian Century: "in a recent address here before the liberal John Reed club [Wise] said that Hearst and Coughlin are the two chief exponents of fascism in America. If fascism comes, he added, it will not be identified with any 'shirt' movement, nor with an 'insignia,' but it will probably be 'wrapped up in the American flag and heralded as a plea for liberty and preservation of the constitution.'"
Another early quote is that of Halford E. Luccock, in Keeping Life Out of Confusion (1938): "When and if fascism comes to America it will not be labeled 'made in Germany'; it will not be marked with a swastika; it will not even be called fascism; it will be called, of course, 'Americanism.'" (This quote is also attributed in a New York Times article from September 12, 1938, page 15 as having been given in one of Luccock's sermons.)
Harrison Evans Salisbury in 1971 remarked about Lewis: "Sinclair Lewis aptly predicted in It Can't Happen Here that if fascism came to America it would come wrapped in the flag and whistling 'The Star Spangled Banner.'"
Source: The Christian Century, Volume 53, Feb 5, 1936, p. 245
Source: Misattributed, p. 29, The Many Americas Shall Be One, Harrison Evans Salisbury. Published by W. W. Norton, 1971.