To put it concisely, we suffer when we resist the noble and irrefutable truth of impermanence and death. We suffer, not because we are basically bad or deserve to be punished, but because of three tragic misunderstandings.
First, we expect that what is always changing should be graspable and predictable. We are born with a craving for resolution and security that governs our thoughts, words, and actions. We are like people in a boat that is falling apart, trying to hold on to the water. The dynamic, energetic, and natural flow of the universe is not acceptable to conventional mind. Our prejudices and addictions are patterns that arise from the fear of a fluid world. Because we mistakenly take what is always changing to be permanent, we suffer.
Second, we proceed as if we were separate from everything else, as if we were a fixed identity, when our true situation is egoless. We insist on being Someone, with a capital S. We get security from defining ourselves as worthless or worthy, superior or inferior. We waste precious time exaggerating or romanticizing or belittling ourselves with a complacent surety that yes, that's who we are. We mistake the openness of our being--the inherent wonder and surprise of each moment--for a solid, irrefutable self. Because of this misunderstanding, we suffer.
Third, we look for happiness in all the wrong places. The Buddha called this habit "mistaking suffering for happiness," like a moth flying into the flame. As we know, moths are not the only ones who will destroy themselves in order to find temporary relief. In terms of how we seek happiness, we are all like the alcoholic who drinks to stop the depression that escalates with every drink, or the junkie who shoots up in order to get relief from the suffering that increases with every fix.
A friend who is always on a diet pointed out that this teaching would be easier to follow if our addictions didn't offer temporary relief. Because we experience short-lived satisfaction from them, we keep getting hooked. In repeating our quest for instant gratification, pursuing addictions of all kinds--some seemingly benign, some obviously lethal--we continue to reinforce old patters of suffering.
Pema Chödrön
The Places That Scare You