Why did athenian orator demosthenes warn his people?

Athenian orator Demosthenes warned his people primarily about the growing threat of Macedonian power under Philip II. He urged Athenians to unite and strengthen their defenses, emphasizing the importance of civic responsibility and military preparedness. His speeches, particularly the "Philippics," aimed to rally the citizens against complacency and to recognize the dangers of external aggression. Demosthenes believed that active participation in politics and defense was crucial for preserving Athenian democracy and autonomy.