It would be reasonable to think that celestial and human beings, and even animals, can also feel certain happiness in this world. Unfortunately, this is not the case. No matter how colorful and fascinating the world appears to be, in the end all phenomena are inseparable from suffering. As the Buddha saw the whole picture, not just a part, of samsara, he came to the final conclusion after having observed the gross and subtle aspects of suffering that samsara is all suffering.

Man’s suffering is minuscule compared with that of the animals, not to mention that of the hell beings or the hungry ghosts. Yet given a choice, how many of us would want to repeat this life again? Not too many! Most people feel that this life is too hard, too tiring and has too much pressure.

- Quote from The Right View, "The Four Noble Truths—the Path Out of Samsara"