History of the Peloponnesian War

For he who for the sake of his comfort shrinks from war is likely, should he remain tranquil, very speedily to forfeit the delights of ease which caused him to shrink; and he who presumes upon his success in war has failed to reflect how treacherous is the confidence which elates him.

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.