Jainism

Contentment Prevents Theft

Being content with what one has removes the motivation to steal.

Santosh (contentment) is the inner quality that makes asteya natural. When satisfied with one's situation, the desire to take others' possessions disappears. Inner wealth surpasses material wealth.

The contented person is the richest of all.

Jain Teaching, Virtue Commentary

Contentment is the psychological foundation of non-stealing.

Psychology of Ethics