Chinul, a twelfth-century Korean Seon learn, emphasised that insight into our correct mother nature is unexpected, but is always to be followed by practice to ripen the insight and attain total Buddhahood. The modern day Korean Seon learn Seongcheol opposed this, emphasizing "unexpected enlightenment, sudden cultivation". This is often my https://a-course-in-miracles.org/a-course-in-miracles/