The Marxist and liberal approaches to the state represent two fundamentally divergent perspectives, rooted in contrasting assumptions about human nature, society, economy, and power. Their theoretical differences are premised on their distinct analyses of class, property, and the role of the state in maintaining or transforming social order.

1. The Liberal Approach to the State:

• Nature and Origin: Liberals generally view the state as a necessary institution, arising from a social contract among individuals to protect their natural rights (life, liberty, property) and ensure order. It is seen as a rational creation designed to serve the common good.
• Role and Purpose: The state's primary role is to act as a neutral arbiter, mediating conflicts between competing interests in society. It establishes and enforces laws, protects individual liberties, provides public goods, and ensures a level playing field for economic activity. It is expected to be impartial and accountable to the citizens.
• Limited Government: Liberals advocate for a limited state, whose powers are constrained by a constitution, rule of law, and democratic institutions. This prevents the state from infringing upon individual freedoms.
• Pluralism: Society is seen as composed of diverse groups with competing interests, and the state's role is to balance these interests, ensuring no single group dominates.
• Democracy: Liberalism strongly associates the state with democratic governance, where citizens participate in selecting their representatives and holding them accountable.

2. The Marxist Approach to the State:

• Nature and Origin: Marxists reject the idea of the state as a neutral arbiter or a product of a social contract. Instead, they see the state as a superstructure, a reflection of the underlying economic base (mode of production). It arises out of class conflict and is an instrument of class domination.
• Role and Purpose: The state's primary role is to maintain and legitimize the power of the ruling class (the bourgeoisie in capitalist societies). It protects private property, enforces capitalist relations of production, and suppresses dissent from the exploited class (the proletariat). Laws, institutions, and ideologies are all geared towards preserving the existing class structure.
• Instrument of Oppression: The state is inherently coercive and serves the interests of capital. Even democratic states are seen as 'bourgeois democracies,' offering only formal equality while masking substantive class inequality.
• Historical Materialism: The state is a historical phenomenon, destined to wither away in a communist society where class distinctions have been abolished and the means of production are collectively owned.
• Revolution: For Marxists, the state cannot be reformed to serve the interests of the working class; it must be overthrown through a proletarian revolution, leading to a transitional 'dictatorship of the proletariat' before its eventual dissolution.

Grounds for Theoretical Differences:

The fundamental differences between these two approaches are premised on their contrasting views on:

1. Human Nature: Liberals often assume rational, self-interested individuals capable of cooperation and moral choice. Marxists view human nature as shaped by social and economic conditions, with individuals' consciousness and actions determined by their class position.
2. Society and Class: Liberals see society as a collection of individuals and groups with diverse interests, where conflicts can be resolved through negotiation and compromise. Marxists see society as fundamentally divided into antagonistic classes based on their relationship to the means of production, with inherent and irreconcilable conflicts.
3. Economy and Property: Liberals uphold private property as a fundamental right and the market economy as the most efficient system. Marxists view private property as the source of exploitation and inequality, advocating for collective ownership of the means of production.
4. Power: Liberals tend to see power as diffused and potentially accountable, residing in institutions and laws. Marxists see power as concentrated in the hands of the economically dominant class, which uses the state to maintain its hegemony.
5. Justice and Equality: Liberals emphasize formal equality before the law and equality of opportunity. Marxists argue that true justice and equality require the abolition of class distinctions and economic exploitation, which the state, in its current form, prevents.

In essence, while liberalism views the state as a potentially benevolent and necessary institution for order and individual freedom within a capitalist framework, Marxism sees it as an inherently oppressive tool of the ruling class, destined for revolutionary overthrow to achieve a classless, stateless society.