Source: The Esoteric Tradition (1935), Chapter 2
“The Druids taught the people of Britain and Gaul concerning the immortality of the soul. They believed in transmigration and apparently in reincarnation. They borrowed in one life, promising to pay back in the next. They believed in a purgatorial type of hell where they would be purged of their sins, afterward passing on to the happiness of unity with the gods. The Druids taught that all men would be saved, but that some must return to earth many times to learn the lessons of human life and to overcome the inherent evil of their own natures.”
The Secret Teachings of All Ages,The Druidic Mysteries of Britain & Gaul, p. 46, https://ia800809.us.archive.org/15/items/Thesecretteachingsofallages2/The%20Secret%20Teachings%20Of%20All%20Ages%20-%20Manly%20P.%20Hall.pdf
The Secret Teachings of All Ages (1928)
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Manly P. Hall 13
Canadian writer and mystic 1901–1990Related quotes

“It was a lesson that I would learn in time though it wasn't Hegbert who taught me.”
Source: A Walk to Remember

Movieline Magazine "Gillian of the Spirits" http://gilliananderson.ws/transcripts/98/98movieline.shtml (January, 1999)
1990s

Source: The Reappearance of the Christ (1948), p. 324

“Some lessons can't be taught, they simply have to be learned.”
Source: Vanishing Acts

Rational Theology and the Creativity of God (Oxford: Basil Blackwell, 1982), pp. 201-202.