The root of suffering is attachment.

the tragedy of an attachment is that if its object is not attained it causes unhappiness. But if it is attained, it does not cause happiness – it merely causes a flash of pleasure followed by weariness, and it is always accompanied, of course, by the anxiety that you may lose the object of your attachment.

As the Buddha taught, the cause of suffering is attachment; the end of attachment will mean the end of suffering.

Now the tragedy of an attachment is that if its object is not attained it causes unhappiness. But if it is attained, it does not cause happiness — it merely causes a flash of pleasure followed by weariness; and it is always accompanied, of course, by the anxiety that you may lose the object of your attachment. You will say, “Can’t I keep just one attachment?” Of course. You can keep as many as you want. But for each attachment you pay a price in lost happiness. Think of this: The nature of attachments is such, that even if you satisfy many of them in the course of a single day, the one attachment that was not satisfied will prey upon your mind and make you unhappy.

All suffering originates from craving, from attachment, from desire.

What actually causes suffering are the beliefs you hold about those things.

In attachment there is pain, and in pain deliverance, so that at this point attachment itself offers no obstacle, and the liberated one is at last free to love with all his might and to suffer with all his heart. This is not because he has learned the trick of splitting himself into higher and lower selves so that he can watch himself with inward indifference, but rather because he has found the meeting-point of the limit of wisdom and the limit of foolishness. The Bodhisattva is the fool who has become wise by persisting in his folly.

shared weakness of some kind — some need for attachment.

She was capable of causing me pain, but no longer any joy. Pain alone kept my wearisome attachment alive.

Attachment is the great fabricator of illusions; reality can be obtained only by someone who is detached.

All action leads to suffering, someone else's, or one's own.

all our suffering is associated with this pre-occupation. All loss and gain, pleasure and pain arise because we identify so closely with this vague feeling of selfness that we have. We are so emotionally involved with and attached to this "self" that we take it for granted.

Pain is inevitable, from this perspective, but suffering is an optional extra, resulting from our attachments, which represent our attempt to try to deny the unavoidable truth that everything is impermanent.

These are four pairs of opposites — four things that we like and become attached to and four things that we don’t like and try to avoid. The basic message is that when we are caught up in the eight worldly dharmas, we suffer. First, we like pleasure; we are attached to it. Conversely, we don’t like pain. Second, we like and are attached to praise. We try to avoid criticism and blame. Third, we like and are attached to fame. We dislike and try to avoid disgrace. Finally, we are attached to gain, to getting what we want. We don’t like losing what we have.