Experience may be defined as the cognitive element which the course of life has brutally forced upon me, without reason. It implies a conservative, inert clinging to former ideas which has been conquered. This purely brute force is Secundan.
This passage has been obtained from the transcription provided by the Peirce Study Group at the University of Navarra
http://www.commens.org/dictionary/entry/quote-letters-mario-calderoni-2