The source of all of the quotes below (so far) is Plutarch's Morals, mostly the Sayings of Spartans (vol. III)

When an Argive said once upon a time, “There are many tombs of Spartans in our country,” a Spartan said, “But there is not a single tomb of an Argive in our country,” indicating by this that the Spartans had often set foot in Argos, but the Argives had never set foot in Sparta.

Philip wrote at the time when he entered their country, asking whether they wished that he should come as a friend or as a foe; and they made answer, “Neither.”

A Spartan being asked what he knew, said, “How to be free.”

When [after the battle of Plataea] some people were amazed at the costliness of the raiment found among the spoils of the barbarians, he [Pausanias] said that it would have been better for them to be themselves men of worth than to possess things of worth.

When a Persian asked what kind of government he [Lysander] commended most highly, he said, “The government which duly awards what is fitting to both the brave and the cowardly.”

When someone inquired why he [Demaratus] was an exile from Sparta, being a king, he said, “Because her laws are more powerful than I am.”

When someone asked why they visited disgrace upon those among them who lost their shields, but did not do the same thing to those who lost their helmets or their breastplates, he [Demaratus] said, “Because these they put on for their own sake, but the shield for the common good of the whole line.”

When someone said to Astycratidas, after the defeat of Agis their king in the battle against Antipater in the vicinity of Megalopolis, “What will you do, men of Sparta? Will you be subject to the Macedonians? he said, “What! Is there any way in which Antipater can forbid us to die fighting for Sparta?”

Being asked how much land the Spartans controlled, he [Archidamus, son of Agesilaus] said, “As much as they can reach with the spear.”

When someone inquired how many Spartans there were in all, he [Ariston] said, “Enough to keep away our enemies.”

Androcleidas the Spartan, who had a crippled leg, enrolled himself among the fighting-men. And when some persons were insistent that he be not accepted because he was crippled, he said, “But I do not have to run away, but to stay where I am when I fight the opposing foe.”

The younger Agis, when Demades said that the jugglers who swallow swords use the Spartan swords because of their shortness, retorted, “But all the same the Spartans reach their enemies with their swords.”

He [Agis son of Archidamus] came alone on an embassy to Philip, and when Philip exclaimed, “What is this? Have you come all alone?”, he said, “Yes, for I came to only one man.”

When someone brought forward a plan for the freedom of the Greeks, which, while not lacking idealism, was difficult to put into practice, he [Agis son of Archidamus] said, “Your words, my friend, need the backing of power and money.”

He [Agis son of Archidamus] said that the Spartans did not ask ‘how many are the enemy,’ but ‘where are they?’

When Philip wrote to them, “If I invade Laconia, I shall turn you out,” they wrote back, “If.”