Difficulty of subsistence made the invaders reduce the numbers of the army to a point at which it might live on the country during the prosecution of… - Thucydides

(Pericles:) We ought not to be troubled about them (houses and lands) or to think much of them in comparison; they are only the garden of the house, the superfluous ornament of wealth; and you may be sure that if we cling to our freedom and preserve that, we shall soon enough recover all the rest.But, if we are the servants of others, we shall be sure to lose not only freedom, but all that freedom gives.

(Book 2 Chapter 62.3)

[T]heir swaying bodies reflected the agitation of their minds, and they suffered the worst agony of all, ever just within the reach of safety or just on the point of destruction.

(Archidamus:) The allies of the Athenians are not less numerous; they pay them tribute too; and war is not an affair of arms, but of money which gives to arms their use, and which is needed above all things when a continental is fighting against a maritime power:

let us find money first, and then we may safely allow our minds to be excited by the speeches of our allies. We, on whom the future responsibility, whether for good or evil, will chiefly fall, should calmly reflect on the consequences which may follow.

(Book 1 Chapter 83.2-3)