INTEREST will not lie

Meaning & Analysis

A person's self-interest is a reliable and truthful indicator of their underlying motivations and intentions; it cannot be deceptive.

Insights

The Infallible Motivator

The proverb asserts that the ultimate, unvarnished truth of human motivation is self-interest. Unlike words, which can deceive, one's personal advantage is a dependable guide to their genuine intentions and future behavior.

A Predictive Tool

It functions as a pragmatic, if cynical, tool for predicting behavior. By understanding what benefits a person, one can forecast their actions more accurately than by trusting their promises or moral claims.

The Compelling Force

Interest is portrayed as a powerful, almost irresistible force that can compel individuals to act, even causing them to override their professed principles or moral scruples when a personal benefit is at stake.

Historical and Philosophical Context

This proverb reflects the intellectual climate of early modern England, aligning with the rise of economic individualism and political realism seen in the works of thinkers like Thomas Hobbes. It posits self-interest not merely as a motive, but as a fundamental law of human nature.

Principle of Political Realism

The proverb serves as a foundational principle for political realism (Realpolitik), suggesting that the most reliable way to understand the actions of individuals or nations is to analyze their underlying interests, rather than their stated ideologies or moral positions.

Psychological Truth

Psychologically, the proverb points to the concept of motivated reasoning, where an individual’s desires and benefits shape their actions and justifications. It suggests that self-interest is an incorruptible, core driver that operates beneath layers of social pretense.

Rhetorical Devices

Personification

The abstract concept of 'Interest' is given the human quality of being unable to lie, personifying it as an active, authoritative force that dictates truth and action.

Aphoristic Brevity

The statement's power comes from its direct, concise, and aphoristic structure. Its brevity makes it sound like an irrefutable law of human behavior.

Negative Assertion

By stating what interest 'will not' do (lie), the proverb uses a negative construction to make a powerful positive assertion about its truthfulness, a rhetorical strategy that adds emphasis.

self-interestmotivationtruthrealismcynicismpsychology
Analyzed with gemini-2.5-pro on August 3, 2025

Transcription

Quotations

Interest will not lie, every Man will be for his own Interest.

1677, YARRANTON, Eng. Improvem., I 110

Our English proverb is, Interest will not lie; interest will make a man do that which otherwise he would not do.

1688, BUNYAN, Work Jesus Christ, Wks., I 164

'Tis a common Proverb, that Interest will not Lye.

1709, KINGSTON, Apoph. Cur., 386, p. 80

Original Scan

INTEREST will not lie - a scanned entry from Tilley's 1950 Dictionary of Proverbs.
Scan courtesy of HathiTrust Digital Library.
Used under CC BY-NC 3.0.

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Last updated: January 27, 2026