Franklin presents saving as economically comparable to earning because money that is not unnecessarily spent remains available for future use. Increasing income is one way to improve a financial position, but reducing avoidable expenditure can have a similar effect on the amount ultimately retained. The saying therefore gives practical importance to frugality as well as productive work.

The comparison is not literally exact in every circumstance. Earnings may be taxed, saving opportunities depend on necessary expenses, and cutting spending cannot always substitute for insufficient income. Franklin’s broader point is that financial progress depends on what a person keeps as well as what they receive. Even modest amounts preserved through careful spending can accumulate over time and contribute to greater financial security.