No amount of experimentation can ever prove me right; a single experiment can prove me wrong.

Immorality: the morality of those who are having a better time.

There are no shortcuts in evolution.

Hope is the only bee that makes honey without flowers.

Principles have no real force except when one is well-fed.

A friend is one who knows you and loves you just the same.

Remember that the most valuable antiques are dear old friends.

Be not simply good - be good for something.

My fellow Americans, ask not what your country can do for you, ask what you can do for your country.

Gratitude is the fairest blossom that springs from the soul.

My motto is: Contented with little, yet wishing for more.

Unless we remember we cannot understand.

Appearances are a glimpse of the unseen.

The life of the dead is placed in the memory of the living.

Without craftsmanship, inspiration is a mere reed shaken in the wind.

Judge a man by his questions rather than his answers.

Challenging the meaning of life is the truest expression of the state of being human.

There is no influence like the influence of habit.

Courage is fire, and bullying is smoke.

Nothing can be done except little by little.

Remember upon the conduct of each depends on the fate of all.

Silence is the sleep that nourishes wisdom.

Have patience. All things are difficult before they become easy.

The sun, the earth, love, friends, and our very breath are parts of the banquet.

Tears of joy are like the summer raindrops pierced by sunbeams.

I want to do with you what spring does with cherry trees.

An effort made for the happiness of others lifts above ourselves.

It is amazing what you can accomplish if you do not care who gets the credit.

If you do not think about your future, you cannot have one.

Problems are not the problem; coping is the problem.

Friends are the siblings God never gave us.

Your own mind is a sacred enclosure into which nothing harmful can enter except with your permission.

Change your life today. Don't gamble on the future, act now, without delay.

Think in the morning. Act in the noon. Eat in the evening. Sleep in the night.

You can't wait for inspiration. You have to go after it with a club.

There is always one moment in childhood when the door opens and lets the future in.

Ten people who speak make more noise than ten thousand who are silent.

We must not allow other people's limited perceptions to define us.

What is a soul? It's like electricity - we don't really know what it is, but it's a force that can light a room.

Try to be like the turtle - at ease in your own shell.

Better remain silent, better not even think, if you are not prepared to act.

Perfection is the child of time.

No matter what people tell you, words and ideas can change the world.

The hardest thing to understand in the world is the income tax.

Find something you're passionate about and keep tremendously interested in it.

In this world, nothing can be said to be certain, except death and taxes.

Innovation distinguishes between a leader and a follower.

The glow of one warm thought is to me worth more than money.

God loves each of us as if there were only one of us.