There's only one corner of the universe you can be certain of improving，and that's your own self.

The writer’s duty is to tell the terrible truth, and it is the reader’s duty to learn from it.

A great way to understand yourself is to seriously reflect on everything you find irritating in others. 

我们必须弥合科学研究与实际农业应用之间的差距。

最有趣的艺术是提出问题的艺术。

思维法则的有效性不依赖于它们所应用对象的性质。

解释：向外物游览就要要求外物的完备，向自己内心求取，则能充实完善自身。