The Will to Power · Friedrich Wilhelm Nietzsche
778.
(1) The _dominating passion,_ which may even bring the supremest form of health with it: in this case the co-ordination of the internal system and its functions to perform one task is best attained,--but this is almost a definition of health. (2) The antagonism of the passions the double, treble, and multiple soul in one breast:[6] this is very unhealthy; it is a sign of inner ruin and of disintegration, betraying and promoting an internal dualism and anarchy--unless, of course, one passion becomes master. _Return to health._ (3) The juxtaposition of passions without their being either opposed or united with one another. Very often transitory, and then, as soon as order is established, this condition may be a healthy one. A most interesting class of men belong to this order, the chameleons; they are not necessarily at loggerheads with themselves, they are both happy and secure, but they cannot develop--their moods lie side by side, even though they may seem to lie far apart. They change, but they become nothing.
Text from Project Gutenberg, public domain in the United States.