Fooling 'self

I don't think I'll change my old ways. I end up riding on the crappiest days while I don't do anything on the nice ones. Yesterday it was 25F and I decided to do a longer ride. I knew I had a cold but went anyway - I wasn't sick just had a bit of a cough. Today it is like in the mid 40s and I feel like total shit - no voice, coughing crap up, chills and all that. Sometimes I can ride through these things with no consequences while other times I can't.