Also it seems an awkward phrase... I would expect something like 'whatever
I think, that will become for me'

But here's something along those lines:

Vohāranānattavasena pana yasmā ‘itthī bhavissāmi puriso bhavissāmi,
khattiyo bhavissāmi brāhmaṇo bhavissāmī’ti evaṃ tassa tassa attabhāvassa
janakaṃ kammaṃ karīyati, tasmā vohāranānattato kammanānattaṃ.

-- DhS-a


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