 He was a leading proponent of orthogenesis, the idea that evolution occurs in a directional, goal-driven way.Teilhard argued in Darwinian terms with respect to biology, and supported the synthetic model of evolution, but argued in Lamarckian terms for the development of culture, primarily through the vehicle of education.Teilhard made a total commitment to the evolutionary process in the 1920s as the core of his spirituality, at a time when other religious thinkers felt evolutionary thinking challenged the structure of conventional Christian faith.