Our possibilities of happiness are already restricted by our constitution. Unhappiness is much less difficult to experience. We are threatened with suffering from three directions: from our own body, which is doomed to decay and dissolution and which cannot even do without pain and anxiety as warning signals; from the external world, which may rage against us with overwhelming and merciless forces of destruction; and finally from our relations to other men. The suffering which comes from this last source is perhaps more painful to us than any other.

as long as we structure our lives in a way where our happiness is dependent upon something we cannot control, then we will experience pain.

The search for happiness is natural, because it is the constitutional position of the spirit soul to be eternally joyful. But our search for happiness in the external, physical world is always frustrated; we look everywhere, never realizing permanent pleasure. Temporary, relative pleasure is certainly here to be had, but it is always accompanied by its counterpart: pain. Those who are wise, then, look within, learning how to pursue not only the relative pleasure of this world but, more to the point, they focus on the higher pleasure of the spiritual realm.

Is there a form of happiness beyond the mere repetition of pleasure and avoidance of pain? Is there a happiness that does not depend upon having one’s favourite foods available, or friends and loved ones within arm’s reach, or good books to read, or something to look forward to on the weekend? Is it possible to be happy before anything happens, before one’s desires are gratified, in spite of life’s difficulties, in the very midst of physical pain, old age, disease, and death?

The U.S. Constitution doesn't guarantee happiness, only the pursuit of it. Your have to catch up with it yourself.

Every pain is to be avoided, except those whose endurance will enable the avoidance of greater pain, and every possible happiness is to be harvested, save those whose foregoing will help the universe to larger happiness. There is no obligation commanding any being to endure misery save to avoid misery, and no consideration demanding any one to neglect happiness save for larger happiness—those ascetics who proclaim the divinity of wretchedness to the contrary notwithstanding.

Everybody enjoys what feels good. Everyone wants to live a carefree, happy, and easy life, to fall in love and have amazing sex and relationships, to look perfect and make money and be popular and well-respected and admired and a total baller to the point that people part like the Red Sea when they walk into the room. Everybody wants that. It’s easy to want that. A more interesting question, a question that most people never consider, is, “What pain do you want in your life? What are you willing to struggle for?” Because that seems to be a greater determinant of how our lives turn out.

Speaking of happiness and peace, what is the purpose of our existence in this world? Is it to find happiness? Or to experience suffering? Of course, most people would say, “Happiness!” In reality, how many people actually enjoy happiness and peace? What we hear and see most often are the wails of grief over the catastrophes of this world. These include natural disasters and man-made calamities such as war, violence, famine, poverty, and various stresses and anxieties experienced in everyday life. Very few people think of life as truly happy.

And whatever you make of the country-by-country surveys of national happiness that are now published with some regularity, it's striking that the 'happiest' countries are never those where self-help books sell the most, nor indeed where professional psychotherapists are most widely consulted. The existence of a thriving 'happiness industry' clearly isn't sufficient to engender national happiness, and it's not unreasonable to suspect that it might make matters worse. Yet the ineffectiveness of modern strategies for happiness is really just a small part of the problem. There are good reasons to believe that the whole notion of 'seeking happiness' is flawed to begin with. For one thing, who says happiness is a valid goal in the first place? Religions have never placed much explicit emphasis on it, at least as far as this world is concerned; philosophers have certainly not been unanimous in endorsing it, either. And any evolutionary psychologist will tell you that evolution has little interest in your being happy, beyond trying to make sure that you're not so listless or miserable that you lose the will to reproduce. Even assuming happiness to be a worthy target, though, a worse pitfall awaits, which is that aiming for it seems to reduce your chances of ever attaining it. 'Ask yourself whether you are happy,' observed the philosopher John Stuart Mill, 'and you cease to be so.' At best, it would appear, happiness can only be glimpsed out of the corner of an eye, not stared at directly.

The pursuit of happiness is a toxic value that has long defined our culture. It is self-defeating and misleading. Living well does not mean avoiding suffering; it means suffering for the right reasons. Because if we’re going to be forced to suffer by simply existing, we might as well learn how to suffer well.

The makers of our Constitution undertook to secure conditions favorable to the pursuit of happiness. They recognized the significance of man's spiritual nature, of his feelings and of his intellect. They knew that only a part of the pain, pleasure and satisfactions of life are to be found in material things. They sought to protect Americans in their beliefs, their thoughts, their emotions and their sensations. They conferred, as against the government, the right to be let alone -- the most comprehensive of rights and the right most valued by civilized men.

Certainly there would be no future suffering on earth if all life on earth ceased. But most people seem glad that they were born: we do not usually think of present people (and animals) that the pain in their lives outweighs their pleasures...There have been great advances in the human condition due to science: recollect the horrors of childbirth, surgical operations, even of having a tooth out, a hundred years ago. If the human race is not extinguished there may be cures of cancer, senility, and other evils, so that happiness may outweigh unhappiness in the case of more and more individuals. Perhaps our far superior descendants of a million years hence (if they exist) will be possessed of a felicity unimaginable to us.

There is a common misunderstanding among all the human beings who have ever been born on earth that the best way to live is to try to avoid pain and just try to get comfortable. You see this even in insects and animals and birds. All of us are the same. A much more interesting, kind and joyful approach to life is to begin to develop our curiosity, not caring whether the object of our curiosity is bitter or sweet. To lead a life that goes beyond pettiness and prejudice and always wanting to make sure that everything turns out on our own terms, to lead a more passionate, full, and delightful life than that, we must realize that we can endure a lot of pain and pleasure for the sake of finding out who we are and what this world is, how we tick and how our world ticks, how the whole thing just is. If we are committed to comfort at any cost, as soon as we come up against the least edge of pain, we’re going to run; we’ll never know what’s beyond that particular barrier or wall or fearful thing.

Each pleasure is wrapped in pain. You soon discover that you cannot have one without the other … Real happiness is not vulnerable, because it does not depend on circumstances … Real happiness flows from within.