Confucius said, "Isn't it a pleasure to learn from the times?" "Learning without thinking is useless, thinking without learning is dangerous", "By analogy, you can have it!" "Review the past and learn the new", "In a threesome, there must be a teacher." Wait, it's all about education.

Relatively speaking, Xue Ji was written by Mencius, later than The Analects, so The Analects is the earliest educational document.