Around 500 years before the birth of Christ, a young prince named Siddhartha Gautama sat down beneath a fig tree in northern India and refused to move until he understood the nature of suffering. He had grown up in a palace, shielded from the harsh realities of the world by a father who wanted to protect him from pain. But one day, Siddhartha slipped out of the palace gates and encountered, for the first time, an old man, a sick man, a corpse, and a wandering monk. These four sights shattered his comfortable world. If life inevitably contained old age, sickness, and death, what was the point of pleasure and luxury? He abandoned his palace, his wife, and his newborn son, and spent years as a wandering ascetic, starving himself and pushing his body to its limits in search of truth. It did not work. Eventually, he sat beneath that fig tree, and after a night of intense meditation, he reached what Buddhists call enlightenment. He became the Buddha, which simply means the awakened one.

What the Buddha discovered beneath that tree was not a theology in the conventional sense. He did not claim to be a god, or a messenger of a god. He claimed to have diagnosed a universal human problem and found a cure. His teaching has a remarkably clinical quality to it. He compared himself to a physician. A good doctor, he said, does not just tell you that you are ill. They identify the illness, find its cause, determine whether a cure is possible, and then prescribe the treatment. This is exactly the structure of the Buddha's most fundamental teaching: the Four Noble Truths. These four truths are the foundation of everything in Buddhism, and understanding them is the key to understanding what Buddhism is actually about.

The First Noble Truth is perhaps the most misunderstood idea in all of Buddhism. The Pali word used by the Buddha is Dukkha, and it is usually translated as suffering. But this translation, while not wrong, is incomplete. Dukkha has a much richer and more subtle meaning than simple pain or misery. The word originally referred to a wheel whose axle is slightly off-centre. The wheel turns, but there is a persistent wobble, a subtle wrongness that never quite goes away. This is what the Buddha meant. Life is not simply full of pain. Life has a quality of unsatisfactoriness woven into its very fabric. Even when things are going well, there is a background hum of anxiety, a nagging sense that it will not last, that something is slightly off. The First Noble Truth says: this is the nature of existence. Dukkha is real, it is pervasive, and pretending otherwise is the beginning of delusion.

The Buddha was not being pessimistic. He was being precise. He identified three distinct layers of Dukkha. The first is ordinary suffering: physical pain, illness, grief, loss. The second is the suffering of change: even pleasant experiences carry within them the seed of their own ending. You are enjoying a wonderful meal, and somewhere in the background you know it will be over. You are in love, and somewhere you know that love is fragile. The third and deepest layer is what the Buddha called the suffering of conditioned existence itself: the subtle, pervasive dissatisfaction that comes from the fact that we are constantly grasping, constantly wanting things to be other than they are. This third layer is the most important, and it leads directly to the Second Noble Truth.