The Commens Dictionary

Quote from ‘An Essay toward Improving Our Reasoning in Security and in Uberty’

… while action may, in the first place, be purely physical and open to outward inspection, it may also, in the second place, be purely mental and knowable (by others, at any rate, than the actor) only through outward symptoms or indirect effects, and thirdly it may be partly inward and partly outward, as when a person talks, involving some expenditure of potential energy …