Buddha says that the main source of our suffering is the delusions in our mind, such as attachment, anger, and the rest. They cause suffering because they’re distressing, but they also have the function of misrepresenting the world to us — in other words, we’re not in touch with reality.
We will look at the Buddhist approach to how things exist, first conventionally — the view of karma, how the mind exists, how to develop compassion; and then ultimately — the view of dependent arising and emptiness.
Getting in touch with reality is the method for achieving our own happiness and our ability to be of benefit to others.