Four jhānas

Four stages of meditative unification progressively refine rapture, pleasure, equanimity, and mindfulness.

Seclusion, applied and sustained thought, rapture, and pleasure.
Applied and sustained thought subside; unification, rapture, and pleasure remain.
Rapture fades; equanimity, mindfulness, and bodily pleasure remain.
Pleasure and pain are abandoned; mindfulness is purified by equanimity.

Relevant suttas