The following quote is from a monthly newsletter called "The Flatbed Sutra of Louie Wing" which I subscribe to.
The comments in parentheses() are mine, and are my attempt at adding to the understanding of the tezt.
(you may agree or disagree...you're free to do so...as you wish)
Zen Master Daikaku
(1213-1278)
(Although it is said) It takes three incalculable eons to attain buddhahood by accumulating virtue and good qualities,
but if you practice the way of unity of cause and effect (the study and practice of Zen), you (may) realize buddhahood
in one lifetime.
Someone who illumines his own mind (by study and practice) and awakens to his/(her) real nature (their original inherent Buddha
nature) sees that himself/(herself) is originally Buddha,(their original nature is the Buddha nature)
(and they are) not now (only) attaining buddhahood for the first time.
(Question)
"Do those who realize buddhahood by seeing reality not depend on cause and effect?
"Should they not (also) cultivate virtue?"
(Answer)
Although those who realize buddhahood by seeing their true nature may cultivate virtue, they do it for others' benefit, not for
(their own) rewards. Because they teach and transform sentient beings, they (must) teach cause and effect; (that being the nature
of the human mind)
(but) because they know they have no personal gain, they do not depend on merit-they have no mind at all. (i.e. they do not pick
or choose by showing any preference for one thing over another.)
Daikaku's Treatise on Meditation, The Original Face, p. 24,
(translation by) Thomas Cleary
