History of the Peloponnesian War
Thucydides
Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.
For many enterprises which were ill-planned have succeeded because the adversary has proved to be still worse advised, and yet more, which to all appearances were well advised, have turned out the opposite way and brought disgrace. For no one ever carries out a plan with the same confidence with which he conceives it; on the contrary we form our fond schemes with a feeling of security, but when it comes to their execution, we are possessed by fear and fall short of success.
" And so now in our own case, it is because we are suffering wrongs and have ample grounds for complaint that we are stirring up this war, and as soon as we have avenged our wrongs upon the Athenians we will bring the war to an end when occasion offers.
And for many reasons we are likely to prevail: first, because we are superior in point of numbers and in military experience ;