Sometimes, the only way to learn something really well is to revert to the state of mind of a novice and reawaken to the raw observations that you have accumulated instead of relying on the conclusions you have reached from the exogenous premises absorbed through teaching and bookish learning.

Re: Guide to Lisp, v1.20 (Usenet article).

https://groups.google.com/forum/#!msg/comp.lang.li...[groups.google.com]