Here are a few famous quotes giving a few pearls of timeless wisdom:

Everyone, without exception, is searching for happiness.
- Blaise Pascal

The right to happiness is fundamental.
- Anna Pavlova

Not only is there a right to be happy, there is a duty to be happy. So much sadness exists in the world that we are all under obligation to contribute as much joy as likes within our powers.
- John Sutherland Bonnell

There is no duty so much underrated as the duty of being happy.
- Robert Louis Stevenson

Different men seek … happiness in different ways and by different means.
- Aristotle

Happiness … leads none of us by the same route.
- Charles Caleb Colton

Nothing can bring you peace but yourself.
- Ralph Waldo Emerson

Life is a romantic business, but you have to make the romance.
- Oliver Wendell Holmes

Some pursue happiness, others create it.
- Anon

It is not the level of prosperity that makes for happiness but the kinship of heart to heart and the way we look at the world. Both attitudes are within our power, so that a man is happy so long as he chooses to be happy and no one can stop him.
- Aleksandr Solzhenitsyn

How unhappy is he who cannot forgive himself.
- Publilius Syrus

Like swimming, riding, writing or playing golf, happiness can be learned.
- Dr. Boris Sokoloff

Being happy is something you have to learn. I often surprise myself by saying, “Wow, this is it. I guess I’m happy. I’ve got a home that I love. A career that I love. I’m even feeling more and more at peace with myself.” If there’s something else to happiness, let me know. I’m ambitious for that too.
- Harrison Ford

Learn how to feel joy.
- Seneca

It is not easy to find happiness in ourselves, and it is not possible to find it elsewhere.
- Agnes Repplier

To live happily is an inward power of the soul.
- Marcus Aurelius

Happiness is not in our circumstances, but in ourselves. It is not something we see, like a rainbow, or feel, like the heat of a fire. Happiness is something we are.
- John B. Sheerin

Seek to do good, and you will find that happiness will run after you.
- James Freeman Clarke

No one can sincerely try to help another without helping himself.
- Charles Dudley Warner

We cannot hold a torch to light another’s path without brightening our own.
- Ben Sweetland

The happiness of your life depends upon the quality of your thoughts.
- Marcus Aurelius

Happiness is not a matter of events; it depends upon the tides of the mind.
- Alice Meynell

A happy life consists in tranquility of mind.
- Cicero

The greater part of our happiness or misery depends on our dispositions, and not our circumstances.
- Martha Washington

Happiness does not depend on outward things, but on the way we see them.
- Leo Tolstoy

When one door closes, another opens; but often we look so long at the closed door that we do not see the one which has been opened for us.
- Helen Keller

We should not let our fears hold us back from pursuing our hopes.
- John F. Kennedy

Hope never abandons you, you abandon it.
- George Weinberg

Man is what he believes.
- Anton Chekhov

Self-image sets the boundaries of individual accomplishment.
- Maxwell Maltz

Nothing can stop the man with the right mental attitude from achieving his goal; nothing on earth can help the man with the wrong mental attitude.
- W.W. Ziege

If you expect nothing, you’re apt to be surprised. You’ll get it.
- Malcolm Forbes

People only see what they are prepared to see.
- Ralph Waldo Emerson

Think you can, think you can’t; either way you’ll be right.
- Henry Ford

Worry often gives a small thing a big shadow.
- Swedish Proverb

If you worry about what might be, and wonder what might have been, you will ignore what is.
- Anon

When you worry, you go over the same ground endlessly and come out the same place you started. Thinking, on the other hand, makes progress from one place to another… The problem of life is to change worry into thinking, and anxiety into creative action.
- Harold B. Walker

Trouble is only opportunity in work clothes.
- Henry J. Kaiser

To every disadvantage there is a corresponding advantage.
- W. Clement Stone