La Revolución no es un camino de rosas. La Revolución es una lucha a muerte entre el futuro y el pasado.
革命不是一条铺满玫瑰的道路。革命是未来与过去之间的一场生死斗争。
The only way to understand a character is to understand their contradictions.
译文：不怕自身会产生恶念，只怕发觉自身的恶念太迟。
Nothing’s lost forever. In this world, there’s a kind of painful progress. Longing for what we’ve left behind, and dreaming ahead.
That is what learning is. You suddenly understand something you've understood all your life, but in a new way.
The mind is a complex system that can be analyzed at multiple levels.
教育学中的实验方法不仅是研究的工具，更是理解教育过程的基本原则。