Imagine a infinitely huge flat disc spinning at an arbitrary speed. Let, at various angles, one experience various things like heat, pleasure, violence, and so on. At the opposite end, let one experience the counterparts, i.e, cold, pain, non-violence etc.
As one is closer to the center, faster does one travel through these dualities. As one moves farther, one resides in a particular state for a longer duration. Mankind has defined progress by it’s distance from the center. But no matter how far it goes, it is still spinning in that disk going through the whole range of experiences again and again. Just the speed at which it experiences these might vary.
In order to experience equanimity, one has two options. Either get out of this disc, and be a silent observer from the outside. Else, try to be at the very center of the wheel, which does not experience this circular motion.
Probably, the Karma-Yoga in the Gita, has to do with staying at the center, thus, being a part of the system, but not swaying under it’s influence.
My Re 0.02 based on my understanding of Gita. Comments, further explanations are most welcome.
PS: Happy New Year 2009!