The peculiar characteristic of the proposition lies not in its possibly being false, but in its possibly turning out to be false, and this whether it has been positively held or merely by not suspecting the possibility of its denial. That is wherein all advancement and diffusion of knowledge consists.
Note that a proposition is nothing existent, but is a general model, type, or law according to which existents are shaped. [—]
Now a proposition consists of two parts, the predicate, which excites something like an image or dream in the mind of its interpreter, and the subject, or subjects, each of which serves to identify something which the predicate represents.