Standard saying from the old days at NOLS
"If you are hungry, cold, hot, tired, or otherwise miserable, you are doing something wrong. Hungry? stop and eat a snack Cold? stop and put on a layer Hot, stop and take off a layer, tired? slow down the pace, Otherwise miserable? Why not stop and camp- a good nights sleep does wonders." These are not the exact words, but you get the gist.

Another one "rules are for fools" judgement trumps rules any day