Actually, however, life begins less by reaching upward, than by turning upon itself. But what a marvelously insidious, subtle image of life a coiling vital principle would be! And how many dreams the leftward oriented shell, or one that did not conform to the rotation of its species, would inspire!

(Le nouvel esprit scientifique)
Dialectic of Duration. He compared "scientific knowledge" to ordinary knowledge in the way we deal with it and saw error as only illusion: "Scientifically we think the truth as the historical rectification of a long error and we think experience as the rectification of the common and original illusion (illusion première). The role of epistemology in science
Bachelard was a rationalist in the Cartesian sense although he recommended his "non-Cartesian epistemology" as a replacement for the more standard Cartesian epistemology.

He rose to some of the most prestigious positions in the Académie française and influenced many subsequent French philosophers among them Michel Foucault Louis Althusser Dominique Lecourt and Jacques Derrida. To the latter he introduced the concepts of epistemological obstacle and epistemological break (obstacle épistémologique et rupture épistémologique).