The History of the Grecian War (1.32.3-1.32.5)

Now so it is that we have had a custom, both unreasonable in respect of our suit to you and also for the present unprofitable to our own estate.

For having ever till now been unwilling to admit others into league with us, we are now not only suitors for league to others but also left destitute by that means of friends in this our war with the Corinthians. And that which before we thought wisdom, namely, not to enter with others into league because we would not at the discretion of others enter into danger, we now find to have been our weakness and imprudence.

Wherefore, though alone we repulsed the Corinthians in the late battle by sea, yet since they are set to invade us with greater preparation out of Peloponnesus and the rest of Greece, and seeing with our own single power we are not able to go through, and since also the danger, in case they subdue us, would be very great to all Greece, it is necessary that we seek the succours both of you and of whomsoever else we can; and we are also to be pardoned, though we make bold to cross our former custom of not having to do with other men, proceeding not from malice but error of judgment.