Psychology must be based on direct experience and introspection.

Courage is not the absence of fear, but rather the judgment that something else is more important than fear.

The duties of all public officers are, or at least admit of being made, so plain and simple that men of intelligence may readily qualify themselves for their performance.

The more we live by our intellect, the less we understand the meaning of life.

农业现代化不仅仅是技术的升级，更是思维方式的转变。《农业的未来》