I think the point was that Newton devoted a lot of time to things that are not optics, mechanics and mathematics - we do not remember him for the other things o

I think the point was that Newton devoted a lot of time to things that are not optics, mechanics and mathematics - we do not remember him for the other things obviously, which is why it is rarely known, but: https://en.wikipedia.org/wiki/Isaac_Newton's_occult_studies https://en.wikipedia.org/wiki/Isaac_Newton's_occult_studies