Quote by Andrew Fletcher, A Discourse of

That the whole free people of any nation ought to be exercised to arms, not only the example of our ancestors, as appears by the acts of parliament made in both kingdoms to that purpose, and that of the wisest governments among the ancients; but the advantage of choosing out of great numbers, seems clearly to demonstrate. For in countries where husbandry, trade, manufactures, and other mechanical arts are carried on, even in time of war, the impediments of men are so many and so various, that unless the whole people be exercised, no considerable numbers of men can be drawn out, without disturbing those employments, which are the vitals of the political body. Besides, that upon great defeats, and under extreme calamities, from which no government was ever exempted, every nation stands in need of all the people, as the ancients sometimes did of their slaves. And I cannot see why arms should be denied to any man who is not a slave, since they are the only true badges of liberty; and ought never, but in times of utmost necessity, to be put into the hands of mercenaries or slaves: neither can I understand why any man that has arms should not be taught the use of them.http://www.constitution.org/fletchr/fletchr.htm