not to be avoided

See: obligatory
References in classic literature ?
Therefore, the Romans, foreseeing troubles, dealt with them at once, and, even to avoid a war, would not let them come to a head, for they knew that war is not to be avoided, but is only to be put off to the advantage of others; moreover they wished to fight with Philip and Antiochus in Greece so as not to have to do it in Italy; they could have avoided both, but this they did not wish; nor did that ever please them which is for ever in the mouths of the wise ones of our time:--Let us enjoy the benefits of the time--but rather the benefits of their own valour and prudence, for time drives everything before it, and is able to bring with it good as well as evil, and evil as well as good.
And if any one should say: "King Louis yielded the Romagna to Alexander and the kingdom to Spain to avoid war, I answer for the reasons given above that a blunder ought never to be perpetrated to avoid war, because it is not to be avoided, but is only deferred to your disadvantage.