The older I get, the more wise I get, the more I believe in the above statement. As in, not having the mental capacity or brain-power to muse over inequities both in personal and worldly topics is a less emotionally affective position to be in. I grew up in a protestant Christian faith, and while I don't actively participate, I do reflect often on some of the teachings (mostly the Beatitudes) and literature, and only in my 20s did I realize that "Eating the apple from the tree of life" is pretty much a metaphor for our evolutionary development into consciousness, of "knowing right and wrong" as a species.
Intelligence? It's a curse as much as it is a blessing. Folks can disagree with that assertion if they'd like. From my personal studies in literature and philosophy though, I think it's a pretty common understanding amongst a certain tier of thinkers. My apology if I come off sounding a little elitist, but intelligence is a bell curve, and, to quote the famous Demotivational poster, "Not everybody gets to be an astronaut when they grow up."[0]
[0]Link to photo I found via Google search: http://cdn.shopify.com/s/files/1/0535/6917/products/potentia...