.
R.M, Renfield, age 59.

Sanguine temperament, great physical strength, morbidly excitable, periods of gloom, ending in some fixed idea which I cannot make out.

I presume that the sanguine temperament itself and the disturbing influence end in a mentally-accomplished finish, a possibly dangerous man, probably dangerous if unselfish.

In selfish men caution is as secure an armour for their foes as for themselves.

What I think of on this point is, when self is the fixed point the centripetal force is balanced with the centrifugal.