《易传·文言传·乾文言》
他的行动先天而发，但上天不会背弃他，他的行动后天而发，那是依奉天时行事。上天尚且不背弃他，更何况人呢？
先天而天弗违，后天而奉天时，天且弗违，而况于人乎！
His actions arise spontaneously, but heaven will not abandon him; his actions are carried out in accordance with the seasons, but heaven still will not abandon him. If heaven does not abandon him, how could man?