(Evolution) general condition to which all theories, all hypotheses, all systems must bow and which they must satisfy henceforward if they are to be … - Pierre Teilhard de Chardin

The radical defect in all forms of belief in progress, as they are expressed in positivist credos, is that they do not definitely eliminate death. What is the use of detecting a focus of any sort in the van of evolution if that focus can and must one day disintegrate? To satisfy the ultimate requirements of our action, Omega must be independent of the collapse of the forces with which evolution is woven.

I am not a human being enjoying a spiritual life, I am a spiritual being enjoying a human life.

in the course of the growth of research; so that, when they reach the end of their analyses they cannot tell with any certainty whether the structure they have reached is the essence of the matter they are studying, or the reflection of their own thought.