The only real laughter comes from despair.

Immoderate desire is the mark of a child, not a man.

Only idiots refuse to change their minds.

We may encounter many defeats but we must not be defeated.

Every aquarium will eventually leak.

Time flies over us, but leaves its shadow behind.

Wonder is the beginning of wisdom.

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

It is man that makes truth great, not truth that makes man great.

Nature is pleased with simplicity. And nature is no dummy

Tis very certain the desire of life prolongs it.

Thoughts without content are empty, intuitions without concepts are blind.

Where there is anger, there is always pain underneath.

It is neither good nor bad, but thinking makes it so.

Be silent or let thy words be worth more than silence.

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

Wisdom is not the product of schooling, but of the lifelong attempt to acquire it.

Between stimulus and response there is a space. In that space is our power to choose our response. In our response lies our growth and our freedom.

Nothing is so strong as gentleness, nothing so gentle as real strength

Fine clothes may disguise, but silly words will disclose a fool.

It takes a lot of courage to show your dreams to someone else.