Chapter 10, Footnote #04
Under the term esse must be included as well past existence, with reference to a given period as present. They are equally real, in comparison with what is as yet but future. Language is materially deficient, in not enabling us to distinguish with precision between existence as opposed to unreality and present existence as opposed to past. The word existence in English, and esse, adopted by lawyers from the Latin, have the inconvenience of appearing to confine the existence in question to some single period considered as being present.