According to Osho, existence appears frantic for happiness because we chase it directly while unconsciously manufacturing its opposite. Our habits, desires, and comparisons create misery; then a small part of the mind hunts for pleasure, which only flashes briefly and deepens sorrow by contrast. The wise turn from pursuing happiness to understanding and removing the causes of suffering—then happiness arises naturally, as a byproduct.
We keep running after happiness while doing things that make us hurt; stop making the hurt, and happiness shows up by itself.