Principle 01
The Three Instruments 法·术·势
Law (法) is the published code — public, uniform, binding on officials. Technique (术) is the ruler's method of personnel control: 「因任而授官,循名而责实」— appoint to the task, then demand the result the title promised. Authority (势) is the institutional position that makes both enforceable: 「抱法处势则治」— law without power is advice, power without law is a riot. Han Fei's synthesis holds that any one instrument alone fails; the machine runs only on all three.
Principle 02
Self-Interest Psychology 人性自利
「舆人成舆则欲人之富贵,匠人成棺则欲人之夭死」— the carriage-maker wants customers rich, the coffin-maker wants them dead; not from benevolence or malice, but because profit lies that way (利之所在). Han Fei's move is to stop judging this and start designing for it: never build a system that requires people to be better than their interests. Make the desired behavior the profitable behavior, and the calculation people cannot help doing works for you.
Principle 03
The Contradiction Test 矛盾
A man of Chu boasted that his shield could not be pierced and his spear could pierce anything — 「不可同世而立」, the two claims cannot stand in the same world, and the word 矛盾 (spear-shield = contradiction) was born. Han Fei wields this as a method: test every doctrine, policy, or praise by asking which incompatible claims it secretly holds. A position that cannot survive its own contradiction is not a position — it is noise.
Principle 04
Conditions over Tradition 世异则事异
「世异则事异,事异则备变」— times change, affairs change, so preparations must change. Han Fei mocks the antiquarians with the farmer who once saw a rabbit break its neck on a tree stump and sat waiting for more (守株待兔): what worked in one era, repeated as ritual, becomes a joke. 「不期修古,不法常可」— do not model the past, do not canonize the permanent. The standing question: which of our rules is a stump we are still waiting beside?