Those who do wrong to a neighbor when there is no reason to do so are the ones who persevere to the point of destroying him since they see the danger… - Thucydides

For these reasons or reasons very like them he was killed
who, of all the Hellenes in my time, least deserved to come
to so miserable an end, since the whole of his life had been devoted
to the study and the practice of virtue.

(Corinthian:) [B]e not afraid of the immediate danger, but fix your thoughts on the durable peace which will follow. For by war peace is assured, but to remain at peace when you should be going to war may be often very dangerous.

(Book 1 Chapter 124.2)

[F]or a time of public need they thought that there was no man like him. During the peace while he was at the head of affairs he ruled with prudence;
under his guidance Athens was safe, and reached the height of her greatness in his time. When the war began he showed that here too he had formed a true estimate of the Athenian power. He survived the commencement of hostilities two years and six months; and, after his death, his foresight was even better appreciated than during his life.

For he had told the Athenians that if they would be patient and would attend to their navy, and not seek to enlarge their dominion while the war was going on, nor imperil the existence of the city, they would be victorious; but they did all that he told them not to do, and in matters which seemingly had nothing to do with the war, from motives of private ambition and private interest they adopted a policy which had disastrous effects in respect both of themselves and of their allies; their measures, had they been successful, would only have brought honour and profit to individuals, and, when unsuccessful, crippled the city in the conduct of the war.

(Book 2 Chapter 65.4-7)