According to the Buddha, the human mind in its normal state generates "dukkha," which can be translated as suffering, unsatisfactoriness, or just plain misery. He sees it as a characteristic of the human condition. Wherever you go, whatever you do, says the Buddha, you will encounter dukkha, and it will manifest in every situation sooner or later.

Eckhart Tolle

from A New Earth: Awakening to Your Life's Purpose