Notes on Teilhard the Chardin: Initial Postulate

Reading an introduction to Teilhard the Cardin. Some bits are very worth remembering. 

 "No reflective construction would be possible without the initial choice which make us incline heart and mind for existence rather than non-existence." That is the Initial Postulate that Teilhard habitually ask to be granted at the beginning. He explains it in Letters from a Traveler:

  Last night I had a long talk with the Doctor and another passanger on questions of moral philosophy. We finally had to admit that we differ in such fundamentals as: "Is it better to be or not?".
  I believe, in fact, that this is a fundamental option of all thought, a postulate that cannot be proved, but from which everything is deduced. Once it is admitted that being is better than its opposite, it is difficult to stop short of God; if it is not admitted, discussion ceases to be possible.

I found this very in the line of Aquinas. First discuss being and non-being, then everything else follows.
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[1] L'energie Humaine (1937)
[2] Henri de Luback, Teilhard Explained, New York Paulist Press, 1968