The generation that carried on the war has been set apart by its experience. Through our great good fortune, in our youth our hearts were touched with fire. It was given to us to learn at the outset that life is a profound and passionate thing.

– from the famous Memorial Day address delivered by Oliver Wendell Holmes for Memorial Day, May 30, 1884, at Keene, NH, before John Sedgwick Post No. 4, Grand Army of the Republic.

Here is another extract from it:

When it was felt so deeply as it was on both sides that a man ought to take part in the war unless some conscientious scruple or strong practical reason made it impossible, was that feeling simply the requirement of a local majority that their neighbors should agree with them? I think not: I think the feeling was right – in the South as in the North. I think that, as life is action and passion, it is required of a man that he should share the passion and action of his time at peril of being judged not to have lived.

If this be so, the use of this day is obvious. It is true that I cannot argue a man into a desire. If he says to me, Why should I seek to know the secrets of philosophy? Why seek to decipher the hidden laws of creation that are graven upon the tablets of the rocks, or to unravel the history of civilization that is woven in the tissue of our jurisprudence, or to do any great work, either of speculation or of practical affairs? I cannot answer him; or at least my answer is as little worth making for any effect it will have upon his wishes if he asked why I should eat this, or drink that. You must begin by wanting to. But although desire cannot be imparted by argument, it can be by contagion. Feeling begets feeling, and great feeling begets great feeling. We can hardly share the emotions that make this day to us the most sacred day of the year, and embody them in ceremonial pomp, without in some degree imparting them to those who come after us. I believe from the bottom of my heart that our memorial halls and statues and tablets, the tattered flags of our regiments gathered in the Statehouses, are worth more to our young men by way of chastening and inspiration than the monuments of another hundred years of peaceful life could be.

But even if I am wrong, even if those who come after us are to forget all that we hold dear, and the future is to teach and kindle its children in ways as yet unrevealed, it is enough for us that this day is dear and sacred.

The word “sacred” is, strictly speaking, inseparable from religious belief. But anything that is revered may be called sacred by analogy. If we hold liberty to be sacred in this way, then to us, atheists and secularists who revere those who died fighting for liberty, this Memorial Day is sacred too.