Democratic Kampuchea is sometimes described as an atheist state, although its constitution stated that everyone had freedom of religion, or not to hold a religion. However, it specified that what it termed "reactionary religion" would not be permitted. While in practice religious activity was not tolerated, the relationship of the CPK to the majority Cambodian Theravada Buddhism was complex; several key figures in its history such as Tou Samouth and Ta Mok were former monks, along with many lower level cadres, who often proved some of the strictest disciplinarians. While there was extreme harassment of Buddhist institutions, there was a tendency for the CPK regime to internalise and reconfigure the symbolism and language of Cambodian Buddhism so that many revolutionary slogans mimicked the formulae learned by young monks during their training. Some cadres who had previously been monks interpreted their change of vocation as a simple movement from a lower to a higher religion, mirroring attitudes around the growth of Cao Dai in the 1920s.