In the Letter on Humanism (1947), Heidegger distances himself from both humanism and existentialism. Secular Buddhism has its roots in Buddhist modernism and secular humanism. The party operates on the ideologies of socialism, secularism and integral humanism. But there is another conception of humanism implicit in existentialism. There are also organisations promoting irreligion, including humanism and atheism. He was honoured as a Humanist Laureate in the International Academy of Humanism. Some prominent humanists reject the validity of terms like "Christian humanism". IMHS is a Secular organization believing in Humanism and scientific research. Several negative reviews have raised criticisms related to Pinker's humanism and atheism. In his book, "Humanism" (1997), Tony Davies calls these critics "humanist anti-humanists". Their work explores cultural conflict, but arguably the motifs of humanism and cosmopolitanism are dominant. There are number of secular value frameworks, such as consequentialism, freethought, humanism, and utilitarianism. Some Protestant movements grew up along lines of mysticism or renaissance humanism (cf. Transhumanist self-characterisations as a continuation of humanism and Enlightenment thinking correspond with this view. The meaning of the phrase "secular humanism" has evolved over time.