For one who is spiritually immature, everything that happens in life is classified into either good or bad. Going through tough circumstances, not achieving what was expected, getting an earful from a senior, falling ill, having relationship issues… the list is endless, and all these would immediately go into the bad bucket.
Is life any different for one who is spiritually mature? No, they go through the same trials and tribulations. Or at least so it would seem to a neutral external observer.
But for a spiritually mature person, there is no good or bad to begin with. The two buckets do not even exist. All happenings are seen as is, as they are, with no human filter of good or bad. What seems bad today, might turn out to be a blessing in disguise, in the future. What seems amazing today might be a hidden devil.
Even for the seemingly very bad things which happen to them, the spiritually evolved souls realize that this is all a play of past karma and maya only. And hence they do not categorize those as good or bad either – simply as things that happen and nature taking its course. That’s what is meant by “witness consciousness”.