Bliss is the fourth state after body, mind and energy; when they are healthy and in balance — bliss is bound to happen, it comes itself.

Okay, take Upanishad.
body is called annamaya kosha
mind is called manomaya kosha
energy is called pranamaya kosha
and
bliss is called anandmaya kosha

when the earlier three koshas are healthy and in good state, the fourth kosha comes itself.