《放牛班的春天》中的一些经典句子包括：

1. "永不放弃，总有希望在前面等待。"（Never give up, always have hope in front of waiting.）

2. "世事不能说死，有些事情总值得尝试。永不轻言放弃，前方总有希望在等待。"（You can't say, there are things worth trying. Never give up, always have hope in front of waiting.）

3. "此刻，我感到一阵喜悦和乐观，我想向全世界呼叫，但有谁会听呢？没人知道我的存在。"（At this moment, I feel a bit of joy and optimism. I want to call the world, but who will listen？ No one knows my existence.）

4. "每颗心都需要爱，需要温暖，需要宽容，需要理解。每一个孩子都来自纯洁无邪的地方，永远都应该是人间万分疼惜的珍宝。"（Every heart needs love, needs warmth, needs tolerance, needs understanding. Every child comes from a pure and innocent place, and should always be the most cherished treasures in the world.）

5. "永远不要说永远，总有东西要去尝试。"（Never say forever, there is always something that can be done.）

这些句子体现了电影中教师对学生的关爱、鼓励以及学生们内心的变化和成长。