Summarize this text:
"So died these men as became Athenians. You, their survivors, must determine to have as unfaltering a resolution in the field, though you may pray that it may have a happier issue. And not contented with ideas derived only from words of the advantages which are bound up with the defence of your country, though these would furnish a valuable text to a speaker even before an audience so alive to them as the present, you must yourselves realize the power of Athens, and feed your eyes upon her from day to day, till love of her fills your hearts; and then, when all her greatness shall break upon you, you must reflect that it was by courage, sense of duty, and a keen feeling of honour in action that men were enabled to win all this, and that no personal failure in an enterprise could make them consent to deprive their country of their valour, but they laid it at her feet as the most glorious contribution that they could offer. For this offering of their lives made in common by them all they each of them individually received that renown which never grows old, and for a sepulchre, not so much that in which their bones have been deposited, but that noblest of shrines wherein their glory is laid up to be eternally remembered upon every occasion on which deed or story shall call for its commemoration. For heroes have the whole earth for their tomb; and in lands far from their own, where the column with its epitaph declares it, there is enshrined in every breast a record unwritten with no tablet to preserve it, except that of the heart. These take as your model and, judging happiness to be the fruit of freedom and freedom of valour, never decline the dangers of war. For it is not the miserable that would most justly be unsparing of their lives; these have nothing to hope for: it is rather they to whom continued life may bring reverses as yet unknown, and to whom a fall, if it came, would be most tremendous in its consequences. And surely, to a man of spirit, the degradation of cowardice must be immeasurably more grievous than the unfelt death which strikes him in the midst of his strength and patriotism!
"Comfort, therefore, not condolence, is what I have to offer to the parents of the dead who may be here. Numberless are the chances to which, as they know, the life of man is subject; but fortunate indeed are they who draw for their lot a death so glorious as that which has caused your mourning, and to whom life has been so exactly measured as to terminate in the happiness in which it has been passed. Still I know that this is a hard saying, especially when those are in question of whom you will constantly be reminded by seeing in the homes of others blessings of which once you also boasted: for grief is felt not so much for the want of what we have never known, as for the loss of that to which we have been long accustomed. Yet you who are still of an age to beget children must bear up in the hope of having others in their stead; not only will they help you to forget those whom you have lost, but will be to the state at once a reinforcement and a security; for never can a fair or just policy be expected of the citizen who does not, like his fellows, bring to the decision the interests and apprehensions of a father. While those of you who have passed your prime must congratulate yourselves with the thought that the best part of your life was fortunate, and that the brief span that remains will be cheered by the fame of the departed. For it is only the love of honour that never grows old; and honour it is, not gain, as some would have it, that rejoices the heart of age and helplessness.