A deep and pressing need does not overwhelm but is bearable when there is the sense of even a little progress being made toward the fulfillment of that need. It is when one is stuck making no apparent headway at all toward the meeting of the need that it can become crushingly overwhelming. Deep and pressing then becomes deeply depressing. It goes from merely pressing against to pressing with the kind of force that crushes. All this is another way of saying what the ancient proverb said long before me: that "hope deferred makes the heart sick."