Only three of Einstein's dreams have been documented. Katz examines them in relationship to Einstein's life as revealed in his extensive correspondence and biographies. Dream one, at age thirty-nine, was a reflection of Einstein's guilt following his first success. Dream two, at age forty-seven, involved Einstein's unresolved guilt over his father's death. In the third dream, at age fifty, Einstein confronted the anxieties of old age. Katz concludes, "Within all three dreams is the sternly admonishing and punitive voice of feared and detested authority with which Einstein struggled all his life."