Wow, I was getting behind on the replies .
Hmm with regard to the instincts being āless appropriateā than using rationality to ātameā them I think that requires some qualifying.
I think Iād follow Nietzscheās lead in saying (wo)man is just a mass of drives and instincts all in conflict with one another and to become a higher (wo!)man one must learn to harness and reign these in and bring them under oneās control. To put it more simply to develop the personality such that they gain some form of equilibrium without one instinct dominating the other- rationality vs. the instincts being the most simplistic interpretation.
So I donāt think rationality should hold precedence over the instincts but rather to have full mental health it is a case of allowing the ābaserā āanimalā instincts to be expressed in a way that is socially acceptable (and so too rationality but that is much easier to express and not be condemned by society as society is supportive of intellectual pursuits in general), or at least to not get caught by society for expressing them .
So mental health consists of allowing all the instincts to be expressed in some form or another (also known as self actualization, but as Maslow points out this is still an extremely rare phenomenon in human as he predicts as little as 3% maybe even one- I forget- of the population will ever achieve this- Iād put it closer to one percent from my experience)- albeit with the ābaserā ones such as aggression being sublimated through competitive games etc. Intelligence I think is being able to corral all these impulses into activities which will not f*ck you over in the long run, and ideally are even applauded and encouraged.