Guys, still throwing with suttas?
We don't even know for sure whether the Buddha spoke Pali. (now don't go and debate this here
But come on Alex, it can be quite clear what the Buddha meant with jhana has nothing to do with absorption in a book or 'flow' or something like that. The jhanas are the peaks
of meditative development. The suttas seem to say the formless attainments aren't even needed to become fully enlightened, that's how strong the jhanas must be. It's ridiculous to think you can just attain this without being aware of it, let alone forgetting it... If "absorption" in the 5 sense activities would be samma samadhi, thousands of people would have become enlightened while watching television.
Jhana is absorption in the 6th sense, the mind. Nothing more, and certainly nothing less. The 5 senses are gone, all thoughts are gone, the sense of time is gone and the will to influence the process is gone also. It's just awareness of the mind itself, totally unlike anything else, like another dimension. And it'll be one of the strongest memories you'll have.
Now, its importance in the first stages of the development can be discussed, however we shouldn't underestimate the actual experience.