Hobbes vs. Thrasymachus: Justice, Power, and the Social Contract

Thrasymachus's Definition of Justice

To address whether Hobbes's account of justice resembles Thrasymachus's claim that "might makes right," we must first recall the sophist's position. Thrasymachus defined justice as "nothing other than the advantage of the stronger." This is the essence of the might-makes-right doctrine: those with power act justly by definition whenever they exercise that power in their own interest.

Consider a historical example to illustrate this logic. By Thrasymachus's reasoning, European colonizers acted justly in their treatment of Native Americans and Africans precisely because they possessed superior military and technological power. Under his framework, strength confers moral justification—justice itself becomes whatever the powerful declare it to be.

Thrasymachus applied this principle across different government types, observing that "Democracy makes democratic laws, tyranny makes tyrannical laws, and so on with the others. And they declare what they have made—what is to their own advantage—to be just for their subjects." For Thrasymachus, this means that all governments are equally just, because in each case, the ruling power simply defines justice to match its interests. There is no objective standard; justice is purely relative to whoever holds power.

Government Structure and Justice

Here lies the first major divergence between Thrasymachus and Hobbes. While Thrasymachus sees all governments as equally valid expressions of the ruler's advantage, Hobbes explicitly recognizes that some government structures are inherently unjust by virtue of their design. For Hobbes, democracy represents a just form of governance, while tyranny does not. This distinction is not mere preference; it reflects a fundamental difference in how each thinker understands the relationship between power, law, and justice.

Thrasymachus would reject this ranking outright. If might makes right, then tyranny and democracy are equally just—or equally unjust, depending on perspective—because both are simply expressions of whatever power configuration exists. Hobbes, by contrast, grounds justice in something other than raw power: in the covenant that establishes the commonwealth and the laws that protect its members.

Hobbes's Defense Against the 'Might Makes Right' Objection

The objection that Hobbes merely restates "might makes right" fails to account for a crucial functional difference: for whom and for what purpose power is exercised. In Hobbes's framework, justice is not simply what the ruler desires; rather, justice is required if people are to live together in society. When justice breaks down—when covenants are violated—contracts between members become invalid and society collapses. Hobbes's Leviathan rests on the principle that law is the foundation of justice, and the primary obligation of government is to protect subjects from injustice against one another.

This is a fundamentally different role for sovereign power than Thrasymachus envisions. Where Thrasymachus sees the ruler as justified in doing whatever benefits him personally, Hobbes places the sovereign in a position constrained by functional necessity: the commonwealth cannot exist without justice, and justice requires law. The sovereign's power is not unlimited permission for private gain; it is authority to maintain the system of law upon which all benefit depends.

The critical distinction emerges clearly when we imagine each theorist's government in practice. Under a Thrasymachus-inspired regime, the ruler operates with no internal restraint beyond his own interest. He may make laws, break them, exploit subjects, or wage wars as his advantage dictates, and all of this remains "just" by definition. Under Hobbes's account, the sovereign must maintain law and protect subjects from mutual injury, because failure to do so undermines the very foundation of his authority—the covenant itself.

Hobbes therefore can defend his position by arguing that his theory of justice is not reducible to power politics. The sovereign is not a mere engine of private will but rather an abstract enabler of justice. Hobbes's government exists to instantiate and enforce law; the ruler's authority derives from the need to maintain conditions under which justice—covenant-keeping—becomes possible. This is categorically different from Thrasymachus's relativism, in which justice simply vanishes whenever power chooses to ignore it.

Conclusion

While both Hobbes and Thrasymachus acknowledge that power shapes governance, Hobbes departs from "might makes right" by tying justice to functional requirements of social stability rather than to the arbitrary will of rulers. To equate the two positions is to miss the structural difference that makes Hobbes's sovereign a guardian of law rather than a tyrant licensed by philosophy. Definitions of justice rooted in covenant and law are therefore not simply another name for power relativism—they represent a genuine alternative framework in which power itself is constrained by the necessity of maintaining the social contract.