The downfall of civilized states tends to come not from the direct assaults of foes, but from internal decay combined with the consequences of exhaustion in war.
B. H. Liddell HartThe higher level of grand strategy [is] that of conducting war with a far-sighted regard to the state of the peace that will follow.
B. H. Liddell HartThe more usual reason for adopting a strategy of limited aim is that of awaiting a change in the balance of force ... The essential condition of such a strategy is that the drain on him should be disproportionately greater than on oneself.
B. H. Liddell HartIt is only to clear from history that states rarely keep faith with each other, save in so far (and so long) as their promises seem to them to combine with their interests.
B. H. Liddell Hart