If the fifty trillion cells in our body were to adopt the Newtonian-Darwinian model which still governs our present day world, we would be either dead or in the process of degeneration both physically and psychologically.
Wise men in every tradition tell us that suffering brings clarity, illumination; for the Buddha, suffering is the first rule of life, and insofar as some of it arises from our own wrongheadedness — our cherishing of self — we have the cure for it within. Thus in certain cases, suffering may be an effect, as well as a cause, of taking ourselves too seriously. I once met a Zen-trained painter in Japan, in his 90s, who told me that suffering is a privilege, it moves us toward thinking about essential things and shakes us out of shortsighted complacency; when he was a boy, he said, it was believed you should pay for suffering, it proves such a hidden blessing.
One thing that’s very clear to us now, though, is that vision is not like a camera. It’s not like light signals hit your eye and work their way up to the top and they move up some hierarchy and then they get seen. Instead, vision is all about internal activity that’s already happening in your head and there’s a little bit of data that comes up these cables and modifies or modulates that activity. But, essentially, all you’re ever seeing is your internal model of what you believe you’re seeing out there. David Eagleman