Roy Baumeister compares the subconscious to the conscious as hot-wiring a car vs. using keys in the ignition.
Mark Shaller has more:
“Sometimes nonconscious effects can be bigger in sheer magnitude than conscious ones because we can’t moderate stuff we don’t have conscious access to, and the goal stays active.”
I’ve never believed the Hindu/New Age claim that we only use 10 percent of our brains. However, it might be true that only 10 percent of our mind is conscious.