“3779. One may say too much, even upon the best Subject.”
Thomas Fuller (writer) (1654–1734) British physician, preacher, and intellectual
Compare Poor Richard's Almanack (1745) : You may talk too much on the best of subjects.
Introductio ad prudentiam: Part II (1727), Gnomologia (1732)
Variant: 300. A Man may say too much even upon the best of Subjects.