法苑珠林 16.46

16.46

又處處經云。佛言。彌勒不來下有四因緣。一有時福應彼間。二是此間人麁無能受經者。三功德未滿。四世間有能說經者。故彌勒不下。若當來下。餘有五十億七千六十萬歲。彌勒時人眼皆見四千里。由本十種因緣得。一不掩人眼明二不損人眼。三不覆人眼。四不藏人善。五不視殺。六不視盜。七不視婬。八不視陰私及人短。九諸惡事不視。十然燈於佛寺。

Furthermore, the Chuchu jing says: 'The Buddha said: There are four causes and conditions why Maitreya does not come down: first, there are times when the blessings correspond to that realm; second, the people of this realm are crude and none can receive the scriptures; third, his merit is not yet full; fourth, there is someone in the world who can preach the scriptures. Therefore Maitreya does not come down. When he descends in the future, there will remain fifty billion, seven hundred and sixty thousand years. In Maitreya's time, the eyes of people will all see four thousand li, attained through ten primary causes and conditions: first, not obstructing others' eyesight; second, not harming others' eyes; third, not covering others' eyes; fourth, not concealing others' goodness; fifth, not watching killing; sixth, not watching stealing; seventh, not watching sexual misconduct; eighth, not looking at private secrets or others' shortcomings; ninth, not watching any evil deeds; tenth, lighting lamps in Buddhist monasteries.'