The Book of Rituals chapter on administration during various months states that "In April, when lenient sentences, minor offenses, and light punishments are concerned, parole is the best strategy."
事實上，「德主刑輔」的道理，我國先人早已明白，禮月令：「孟夏之月，斷薄刑，決小罪，出輕繫。」