For instance, I'm reading The Happiness Hypothesis: Finding Modern Truth in Ancient Wisdom by Jonathan Haidt. Whether he's citing examples from-- the Bible, Buddha, the Upanishads, Confucius, the Koran. Ovid or Marcus Aurelius-- I find a correlation between each of these and the utility of the subconscious mind.
Personally, on this subject -- I have recently found that a sustained perception of happiness comes from within. In addition, the sensation of happiness that comes from outside oneself is ephemeral. The whole question of contentment or fulfillment seems linked to the meaning of our lives. As I've mentioned in an earlier blog, these are the subjects that interest me most now. I highly recommend Jon's book.