釋門歸敬儀 2.76

2.76

Furthermore, the Sūtra on Maitreya's Rebirth Above states: 'After my parinirvāṇa, if the four assemblies and eight classes [of beings] wish to be born in the fourth heaven, they should, from one day to the seventh day, tie their mindfulness to that heaven, uphold the Buddha's prohibitive precepts, contemplate the ten virtues, practice the path of the ten virtues, and dedicate this merit, wishing to be born before Maitreya Buddha; following that mindfulness, they will attain rebirth.' Mentioning seven days is just speaking in proximate terms; if even that moves that heaven, how much more so an entire lifetime—how could one not attain it?