“There are certain persons for whom pure Truth is a poison.”

The effectiveness of work increases according to geometric progression if there are no interruptions.

We appreciate frankness from those who like us. Frankness from others is called insolence.

The first recipe for happiness is: avoid too lengthy meditation on the past.

Men and women are not born inconstant: they are made so by their early amorous experiences.

A contemptuous indifference turns into an enemy a woman who, well treated, might have been an angel.

The true evil is not the weakening of the body, but the indifference of the soul.

The difficult part in an argument is not to defend one’s opinion but rather to know it.

People are what you make them. A scornful look turns into a complete fool a man of average intelligence.

Without a family, man, alone in the world, trembles with the cold.

No one can be profoundly original who does not avoid eccentricity.

If you value a man’s regard, strive with him. As to liking, you like your newspaper – and despise it.

Conversation would be vastly improved by the constant use of four simple words: I do not know.

We owe to the Middle Ages the two worst inventions of humanity – romantic love and gunpowder.

Modesty and unselfishness – these are the virtues which men praise – and pass by.

If men could regard the events of their own lives with more open minds, they would frequently discover that they did not really desire the things they failed to obtain.

In literature as in love, we are astonished at what is chosen by others.

Claiming certainty without corroborating evidence is stupid.

I’m certainly not into money and prestige. For me there is simply nothing more exciting than people involved in the creation of great products. That is what drives me.

Certainly, last year we did an episode about the census and sampling versus a direct statistic. You just said the word ‘census’, and people fall asleep.

In these matters the only certainty is that nothing is certain.

There are certain things I want to keep to me. I don’t discuss my private life.

Science is the outcome of being prepared to live without certainty and therefore a mark of maturity. It embraces doubt and loose ends.

There is so many things wrong horribly wrong in this world but I know with certainty that you are not one of them.

This only is certain, that there is nothing certain.