Logic and Metaphysics

Reflections of their own thought#

They are now beginning to realise that even the most objective of their observations are steeped in the conventions they adopted at the outset and by forms or habits of thought developed 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 cjf the matter they are studying, or the reflection of their own thought. (Teilhard de Chardin, The Phenomenon of Man)