Autobiography of Friedrich Froebel $c translated and annotated by Emilie Michaelis ... and H. Keatley Moore‪.‬

In silent, trustful association with Nature and my mathematics, I lived for several years after my confirmation. In the latter part of the time my duties led me towards the study of natural laws, and thus towards the perception of the unity so often longed for in soul and spirit, and now at last gradually becoming clear from amidst the outwardly clashing phenomena of Nature.