Nash struggles to reintegrate into society. He stops taking medication because of the severe side effects (impotence and lethargy). He chooses to "ignore" his hallucinations. With the support of his wife, Alicia, he slowly returns to the academic world. In the poignant finale, he is honored by his peers and awarded the Nobel Prize.
It does not mean a high IQ. It does not mean the absence of mental illness. In the context of John Nash’s story, "beautiful" refers to something rawer: the capacity for lucidity in the face of chaos. It is the ability, after decades of shadows, to look at your own fractured consciousness and say, "I know you aren't real, but I will not fight you. I will simply walk around you." a beautiful mind