In fact, statistical evidences actually show that among the ones getting mental illnesses, especially the serious one like Schizophrenia, generally one-third of the population of such people would eventually manage to achieve full recovery, another one-third would gain significant improvements while getting sporadic relapses of such disorders, whilst the remaining rest would just get their disorders worsened day after day until no recovery is conceivably possible.
Lastly, what I am trying to say is that as long as there're hopes in getting improvements for one's mental disorders, one should put in the necessary efforts and work hard towards that goal of gaining more and more sanities and finally full recoveries if possible.