"The main core around which Boutroux's thought revolves is the problem of science and the meaning of natural laws. From 1874, the year of his thesis, “De la Contingence des lois de la Nature”, until his death, i.e. for just under half a century, Boutroux developed and elaborated his critique of science, always insisting on it and basing his theories on freedom and religion on it, which form, one might say, the positive part of his philosophy. (Ugo Spirito, Il pragmatismo nella filosofia contemporanea, Vallecchi Editore, Firenze, 1921, cap. II, p. 142)"