Meaning
The rapture of a spiritual state, the gladdening intoxication that fills the heart in a moment of transport.
Literally: the ecstasy of the state
How Iqbal uses it
Surur-e-haal joins the heart's joy to the mystic state that occasions it, the swelling delight of a soul touched by grace. It is the felt sweetness of a spiritual moment, ecstasy lived in the immediacy of the present.
See it in the verse