From The User Illusion, a book on consciousness:

"In the course of preparing an introductory chapter on Gödel for a forthcoming comprehensive edition of his works, I was struck by the great contrast," wrote Feferman, principal editor of Gödel's Collected Works, "between the deep platonist convictions Gödel held concerning the objective basis of mathematics and the special caution he exercised in revealing these convictions."

One may ask what this silence cost him. Gödel did not share the source of his insights with many people. He did not reveal directly what he believed about the world. He told others only what he could prove.

Gödel lived a very isolated life, trusted few people, and was admitted on several occasions to sanatoriums, for treatment of depression and overwork. He was reserved and suspicious—not least where doctors were concerned, despite being preoccupied by his own health. His depression increased, and in the 1970s it developed into paranoia and the classic syndrome of fear of poisoning. The situation became critical in 1977 when his wife was hospitalized and could no longer cook for him. He would not open the door to nurses, and on 14 January 1978 he died, in the fetal position. "Malnutrition and inanition" resulting from "a personality disturbance" was given as the cause of death."

Just one more reason to despise depression, and one more reason to take it seriously.