Based upon the DN 2 Sāmaññaphala Sutta. (And the Ānāpānasati Sutta)
The second sutta of the Suttanta Piṭaka, in the Collection of the long discourses.
Where the Buddha here exposes his entire Teaching on Meditation
in response to the King Ajātasattu concerning the
"fruits of the spiritual seeking life".
From the Practice of Virtue,
Wise Effort in abandonning the hindrances,
The Samādhi born of happiness,
The progression throught the states of meditation (Jhānas),
with brilliant similes.