To evade insanity and depression, we unconsciously limit the number of people toward whom we are sincerely sympathetic.
We are what we remember. If we lose our memory, we lose our identity and our identity is the accumulation of our experiences. When we walk down the memory lane, it can be unconsciously, willingly, selectively, impetuously or sometimes grudgingly. By following our stream of consciousness we look for lost time and things past. Some reminiscences become anchor points that can take another scope with the wisdom of hindsight. ("Walking down the memory lane" )
The characters who go to make up my stories and novels are not portraits. Characters I invent along with the story that carries them. Attached to them are what I've borrowed, perhaps unconsciously, bit by bit, of persons I have seen or noticed or remembered in the flesh - a cast of countenance here, a manner of walking there, that jumps to the visualizing mind when a story is under way. I don't write by invasion into the life of a real person: my own sense of privacy is too strong for that; and I also know instinctively that living people to whom you are close - those known to you in ways too deep, too overflowing, ever to be plumbed outside love - do not yield to, could never fit into, the demands of a story. Characters take on life sometimes by luck, but I suspect it is when you can write most entirely out of yourself, that a character becomes in its own right another human being on the page.