The Non-Duality understanding clearly explains the reason for humanity's dissatisfaction with life and search for happiness. Desire arises as a consequence of the sense and belief of being a separate individual in the world. This is not who we really are. Reality is an infinite, indivisible Singularity. This is our true nature, our true Being. So when the mind identifies as a limited separate being, it will inevitably feel incomplete. It will never be satisfied. There will always be something missing. It will never be content.

On a lower 'physical' level the human body is somewhat incomplete and needs sustenance from the environment. There is a human urge for union with another human, primarily for the purpose of procreation, but humanity has evolved beyond the need to just survive and procreate. The human mind has evolved. Desire has evolved in the mind, arising from the sense and belief of identifying as a separate individual. This apparently separate individual has wants and desires beyond the 'physical' needs of the body. The mind itself is seeking the peace of union. Reality is Oneness, so this sense of being separate brings with it the feeling of being incomplete, wanting without satisfaction, and ultimately suffering, not being content.

The mind that identifies as separate will initially look outwards for what it feels it wants and needs. It tries to find satisfaction in the world. People look for love, search for happiness, use substances to give some relief or escape from this yearning and unfulfilled desire. They occupy themselves with things to do, to keep the mind from falling into loneliness and yearning for something. This is an understandable search, but ultimately nothing lasts. This is where the mind turns to spirituality, and spiritual teachings that say to practise meditation to bring about peace.

The mind seeks to end its suffering, and after trying to find peace and happiness in the world, it turns inwards to find peace in itself. Meditation seeks to calm the mind. In calming the mind, a clarity is found, a peace and contentment. Without the mind's chatter, and ultimately without the mind's sense and belief of being a separate individual, there is no sufferer and no suffering. The body may encounter pain still, but there is only an experience of this without the mind's sense of suffering.