画龙画虎难画骨，知人知面不知心。
译文：在绘画中，很容易画出龙和虎的外形，但画出它们的骨骼和精神很难，认识这个人，熟悉他的外貌，却不知道他的内心世界。赏析：物欲横流，世事纷扰，人心险恶。我们要提防身边那些心口不一，两面三刀之人。
I do not know what I may appear to the world， but to myself I seem to have been only like a boy playing on the sea-shore， and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary， whilst the great ocean of truth lay all undiscovered before me.
统治阶级掌握着物质生产的手段；无产阶级仅有的是他们的劳动力。