In the Chou I (Classic of Changes) it is stated that the beginningof spring in the first month of the lunar calendar marks an upsurge inthe growth of "male energy" in the three realms of Heaven, Earth and Man, from which all the year's good fortune stems.
周易記載，開春正月，天地人三陽之氣蓬勃增長，一年佳運由此始。