Criticize the act, not the person.

Every aquarium will eventually leak.

There is always time to add a word, never to withdraw one.

It takes a great deal of bravery to stand up to our enemies, but just as much to stand up to our friends.

For beautiful eyes, look for the good in others; for beautiful lips, speak only words of kindness; and for poise, walk with the knowledge that you are never alone.

We thought that we had the answers, it was the questions we had wrong.

The oldest, shortest words- 'yes' and 'no'- are those which require the most thought.

The secret of life, though, is to fall seven times and to get up eight times.

There is nothing more uncommon than common sense.

Act enthusiastic and you will be enthusiastic

Promises are like crying babies in a theater, they should be carried out at once.

The only real mistake is the one from which we learn nothing.

You cannot truly listen to anyone and do anything else at the same time.

Wisdom... comes not from age, but from education and learning.

Those who can not change their minds can not change anything.

I hear and I forget. I see and I remember. I do and I understand.

All imperfection is easier to tolerate if served up in small doses.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self.

Muddy water is best cleared by leaving it alone.

We must live together as brothers or perish together as fools.

And this sensitivity will create new friendships for you - friendships with trees, with birds, with animals, with mountains, with rivers, with oceans, with stars. Life becomes richer as love grows.