HM describes experience at Saõ Paulo Temple in 1982 interview.
Mark L. Grover, "The Mormon Priesthood Revelation and the São Paulo, Brazil Temple," Dialogue: A Journal of Mormon Thought 23, no. 1, Spring 1990, 48
I went onto the Temple construction with my wife, walking among the construction metals and wood and stopped at a certain place. We felt an unusually strong spirit at that time. We held each other and cried for some time. We realized later we were standing at the exact spot of the Celestial Room of the Temple. We felt a strong undescribable feeling in that place. Impressive! Extraordinarily strong. It was one of the most spiritual experiences of our lives.