@ what the Buddha taught
Aṅguttara Nikāya
Ekakanipātapāḷi
Akammaniyavaggo
AN1.23
'I don't, almsmen, see also another one principle what uncultivated leads for such a great loss as this, almsmen; the mind. The mind, almsmen, uncultivated leads for a great loss.'
AN1.24
'I don't, almsmen, see also another one principle what cultivated leads for such a great gain as this, almsmen; the mind. The mind, almsmen, cultivated leads for a great gain.'