Franklin distinguishes between the impression created by speech and the deeper evidence provided by behaviour. Clever or persuasive words may demonstrate intelligence, eloquence or quick thinking, but they do not necessarily reveal what a person genuinely intends. Actions provide stronger evidence because they show what someone is prepared to do rather than merely what they are able to say.

The saying does not imply that words are unimportant, since communication is necessary for expressing ideas and commitments. Its broader point is that behaviour provides an important test of sincerity. When statements and actions conflict, conduct may offer the clearer indication of priorities and motives. Franklin therefore encourages attention to what people consistently do, rather than relying solely on how convincingly they describe their intentions.