Ananussutasutta

sn47.31:4.1 ‘This is the observation of an aspect of principles.’ …

sn47.31:4.2 ‘This observation of an aspect of principles should be developed.’ …

sn47.31:4.3 ‘This observation of an aspect of principles has been developed.’ Such was the vision, knowledge, wisdom, realization, and light that arose in me regarding teachings not learned before from another.”