The History of the Grecian War (1.81.5-1.82.1)

And in this case to let fall the war again will be no honour for us when we are chiefly thought to have begun it.

As for the hope that if we waste their country, the war will soon be at an end, let that never lift us up; for I fear we shall transmit it rather to our children. For it is likely the Athenians have the spirit not to be slaves to their earth, nor as men without experience to be astonished at the war.

"And yet I do not advise that we should stupidly suffer our confederates to be wronged and not apprehend the Athenians in their plots against them, but only not yet to take up arms but to send and expostulate with them, making no great show neither of war nor of sufferance; and in the meantime to make our provision and make friends both of Greeks and barbarians, such as in any place we can get of power either in shipping or money (nor are they to be blamed that being laid in wait for, as we are by the Athenians, take unto them not Grecians only but also barbarians for their safety), and withal to set forth our own.