I think there's some confusion about the idea meaning that we're here to accrue abstract, academic knowledge. This is of course very silly. Foreigner points out some of the major flaws in that line of thinking. It's the cliche of the university professor sitting in an ivory tower thinking he has it all sorted out.
The purpose of (this) life is not knowledge, but experience. Experience is enriching to the soul in much the way a physical organism grows from infancy to adulthood. There is no ultimate goal to experience. It is a means and an end unto itself. On the level of the spiritual, it is like air. You cannot see IT, but yet you cannot escape it either. It's everywhere, it's all you know. And it is a most fundamental form of sustenance.
I'd postulate - and I am only guessing - that the reason this physical lifetime is such a concentrated ride, the reason our bodies evolved into the world through natural selection to be part of this furious race of reproduction, predation and suffering, is because it makes learning absolutely essential. To keep up with it, you are COMPELLED to gather as much experience as possible. You can observe this in young children, who's most powerful, overriding instinct is to learn about everything. After all, they know nothing, but they are gradually learning the dangers of the world. This is why they ask so many questions, and this is why they play. Perhaps, then, the purpose behind our existence here is to be FORCED to explore as much as possible, so that when we step into whatever comes next, we understand the absolute beauty of the gift we've been given. If we'd been born in the spirit world, we would never know any different, so we would take it for granted. But a lifetime in the physical plane, where you can be hurt in so many ways and you're helpless to stop it, is something you'll never forget. When you look at it in this sense, the ultimate futility of life is not something to despair over, but is in fact a thing to celebrate. Look forward to your own death, but learn as much as you can while you're here. And if you feel you're missing the opportunity, don't worry, because you can't stop learning any more than you can stop breathing.
Perhaps - and I'm really going out on a limb here - this is the reason we 'reincarnate'. To truly understand and appreciate the beauty of total liberation, you need to experience its absence, and it needs to be totally, absolutely real. The physical world, then, is just a shadow, a contrast over the real one. It's the domain of death and politics, wherein energy feeds off energy, life feeds off life. And this dynamic just so happens to be the perfect grounds for the ultimate form of self-discovery.
