Perhaps such an idea is related to the false notion that writers have to suffer for art. If so, then I would have to admit to being hampered with a happy childhood. I felt love. The great insights are not a fortune cookie away. Most writers I know sit day after day before a blank screen or page not to spout off what they know but to discover what they didn't know they knew.
Writing is a way to think, to explore.
I sometimes write things I simply did not expect. It stuns me. Your own writing should often surprise you. I suffered through writing essays in high school because I felt I needed to know exactly what I was going to put on paper before I wrote it. Only later did I let myself into the flow of the universe and allow happenstance to occur.