The cause of the two kinds of birth

The cause of the two kinds of birth [43] Then the Bodhisattva Maitreya said to the Buddha, "World-Honored One, for what reason are some of the inhabitants of that land in the embryonic state and the others born by transformation?"
The Buddha replied, "Maitreya, if there are sentient beings who do various meritorious deeds aspiring for birth in that land while still entertaining doubt, such beings are unable to comprehend the Buddha-wisdom, inconceivable wisdom, ineffable wisdom, boundless Mahayana wisdom, and incomparable, unequaled, and unsurpassed supreme wisdom. Although they doubt these wisdoms, they still believe in retribution for evil and reward for virtue and so cultivate a stock of merits, aspiring for birth in that land. Such beings are born in a palace, where they dwell for five hundred years without being able to behold the Buddha, hear his exposition of the Dharma, or see the hosts of bodhisattvas and shravakas. For this reason, that type of birth in the Pure Land is called 'embryonic state.'
"If there are sentient beings who with resolute faith accept these kinds of wisdom, from the Buddha's wisdom to the supreme wisdom, do meritorious deeds and sincerely transfer the merit acquired (to that land), those beings will be born by transformation spontaneously. Seated with legs crossed, in the seven-jewelled lotus-flowers, and instantly attain the same glorious forms, wisdom and virtue as those of other bodhisattvas there."