Chapter 1, Footnote #02
A principle, what
The word principle is derived from the Latin principium: which seems to be compounded of the two words primus, first, or chief, and cipium a termination which seems to be derived from capio, to take, as in mancipium, municipium; to which are analogous, auceps, forceps, and others. It is a term of very vague and very extensive signification: it is applied to any thing which is conceived to serve as a foundation or beginning to any series of operations: in some cases, of physical operations; but of mental operations in the present case.
The principle here in question may be taken for an act of the mind; a sentiment; a sentiment of approbation; a sentiment which, when applied to an action, approves of its utility, as that quality of it by which the measure of approbation or disapprobation bestowed upon it ought to be governed.