The increased ease of staying with the object of meditation and the general increase in clarity of the broad middle of each object's occurrence make this stage much more enjoyable than the first jhana and, in terms of rich enjoyment, tends to be the best of the first four. The later jhanas have other redeeming qualities but, at least in terms of fun and pleasure, the second jhana is generally the best of the standard eight (extended, compounded, and unusual jhanas excepted).
