It’s a commonplace, I think, that if you don’t have a word for something, it’s hard to think about it.
Fr. Stephen Freeman points out that we have no good English words for three things vital to Orthodox spirituality: nous (adverb noetic), hesychia, and nepsis. The consequence of our ignorance of the nous is that we try to use the wrong "tools" to know God:
… [W]e have narrowed the focus of our attention and are probably among the least aware human beings to have ever lived.
Our narrowed focus is largely confined to two aspects: the critical faculty and emotions. The critical faculty mostly studies for facts, compares, judges, measures, and so forth. Emotions run through the varieties of pleasure and pain, largely pairing with the critical faculty to maximize pleasure and minimize pain. This way of experiencing the world is largely the result of living in a consumerist culture. We not only consume things – we are constantly under a barrage of information geared solely towards consumption. We consume everything. Information is more than information – it is information for the purpose of consumption. Even religious notions are governed by consumption. We “like” or “don’t like” Church. We find it useful, or of no interest. People are even known to “shop” for Churches.
The nous is not a faculty of consumption. It is a faculty of perception, particularly of spiritual perception. The modern struggle to experience God often fails because it is carried out by consumers. God, the true and living God, cannot be consumed, nor can He be known by the tools of consumption. Consumerist Christianity peddles experience and ideas about God. It has little or nothing to do with God Himself.
I can recommend no better Sunday reading than the full blog post, A Noetic Life.