CAN one sin in one's thought?
In reality the phrase "sins of thought" is an absurdity. It parses well and its language is above reproach: no grammarian, no purist in diction, could possibly find any fault with it; but if we take it literally, replacing the words by the actual things for which they stand, it becomes apparent that we are confronted by an incoherency, a contradiction in terms, which shows that those who use the phrase have not soundly considered, analysed, understood the notion they are trying to convey. How, indeed, can one sin by "thinking"? How can "thought" -- a health-giving bath in the waters of truth -- ever be a "sin"?
Nevertheless, "sins of thought" are real sins -- big ones, little ones -- but sins in any event; for they are manifestations, they are "acts," of the will; and this truth is so clearly