I certainly hope not. How you can you enjoy the good times without bad to show you why to enjoy the good?

No. You cannot know happiness if you've never known sadness. The inverse is also true. If someone never has another feeling, then they cannot be able to define WHAT they feel.

Only if it's fake happiness.

Probably not on earth but when/if they reach the gates of Heaven they will then be truly happy -- Amen!

Not unless they are totally insane!! No everyday life prevents it simply by the stress we live with daily!!!!!!!!

There is a condition that occurs when kidneys are damaged/diseased known as "Excessive Joy" http://books.google.com/books?id=wONlwtKkUmcC&pg=PA195&lpg=PA195&dq=excessive+joy+kidney+disease&source=web&ots=4mm6A53voQ&sig=HJlbDhcx01ww8NPqTFPfsDyJfXo I know it is off the track, i was sure, though, that happiness as a way of being would be unsustainable.

Happiness is an agreeable feeling or condition arising from good fortune or propitious happening of any kind. It is the possession of those circumstances or that state of being which is attended with enjoyment. It is associated with good luck, good fortune, prosperity, well-being, delight, health, safety, and love. Happiness is generic, and is applied to almost every kind of enjoyment except that of the animal appetites. It ia a state of well-being characterized by emotions ranging from contentment to intense joy. These include: bliss, joy, joyous, carefree, jubilant, exultant, cheerful, playful, amused, fun, glad, gay, gleeful, jolly, jovial, delighted, euphoric, ecstatic, thrilled, elated, enraptured, comfortable, harmonious, and triumphant. Societies, religions, and individuals have various views on the nature of happiness and how to pursue it. Only saint-like persons, who feel that they are no longer interested in the external world, think that happiness is within. For many persons, nothing can make them happy. Our minds are as different as our finger prints - no two are alike. Listening to loud music makes one happy and makes another unhappy. Hence, there can be no single definition for happiness. It is probably impossible to objectively define happiness as humans know and understand it, as internal experiences are subjective by nature. Because of this, explaining happiness as experienced by one individual is as pointless as trying to define the color green such that a completely color blind person could understand the experience of seeing green. As a state and a subject, it has been pursued and commented on extensively throughout world history. "Call no man happy till he is dead." - Aeschylus "Happiness is a positive cash flow." - Fred Adler "Many persons have a wrong idea of what constitutes true happiness. It is not attained through self-gratification but through fidelity to a worthy purpose." - Joseph Addison "True happiness arises, in the first place, from the enjoyment of one's self, and in the next, from the friendship and conversation of a few select companions." - Joseph Addison Happiness is often associated with the presence of favourable circumstances such as a supportive family life, a loving marriage, and economic stability. Kali Yuga, the age of darkness, is the time when these favourables are difficult to find. Unfavorable circumstances - such as abusive relationships, accidents, loss of employment, and conflicts - diminish the amount of happiness a person experiences. In all nations, factors such as hunger, disease, crime, corruption, and warfare can decrease happiness. However, according to several ancient and modern thinkers, happiness is influenced by the attitude and perspective taken on such circumstances. From the observation that fish must become happy by swimming, and birds must become happy by flying. Aristotle points to the unique abilities of man as the route to happiness. Of all the animals only man can sit and contemplate reality. Of all the animals only man can develop social relations to the political level. Thus the contemplative life of a monk or professor, or the political life of a military commander or politician will be the happiest according to their own psyche. The following is the self-reported positive affect (i.e. positive emotion) during the day by 909 employed women in USA: Activities and their positive effect index: Intimate relations 5.10 Socializing 4.59 Relaxing 4.42 Pray/Worship/Meditate 4.35 Eating 4.34 Exercising 4.31 Watching TV 4.19 Shopping 3.95 Preparing food 3.93 On the phone 3.92 Napping 3.87 Taking care of my children 3.86 Computer/Email/ Internet 3.81 Housework 3.73 Working 3.62 Commuting 3.45 Interaction with partners: w/ friends 4.36 w/ relatives 4.17 w/ spouse/Significant other 4.11 w/ children 4.04 w/ clients/customers 3.79 w/ co-workers 3.76 w/ boss 3.52 alone 3.41 Further, happiness is not entirely psychological in nature - it has got a biological basis too. The neurotransmitter dopamine is involved in desire and seems often related to pleasure. Pleasure can be induced artificially with drugs. Use of drugs is not some thing new, it has been used by many including Sanyasis since millenia.

I don't think man is meant to know only happiness. If he didn't know sorrow, how would he recognize happiness? From Kahlil Gibran's. "The Prophet:" Your joy is your sorrow unmasked. And the selfsame well from which your laughter rises was oftentimes filled with your tears. And how else can it be? The deeper that sorrow carves into your being, the more joy you can contain. Is not the cup that hold your wine the very cup that was burned in the potter's oven? And is not the lute that soothes your spirit, the very wood that was hollowed with knives?