Profound thoughts arise only in debate, with a possibility of counterargument, only when there is a possibility of expressing not only correct ideas, but also dubious ideas.

Our country, like every modern state, needs profound democratic reforms. It needs political and ideological pluralism, a mixed economy and protection of human rights and the opening up of society.

Both now and for always, I intend to hold fast to my belief in the hidden strength of the human spirit.

A country which does not respect the rights of its own citizens will not respect the rights of its neighbours

Do not trust governments more than governments trust their own people.

Intellectual freedom is the only guarantee of a scientific - democratic approach to politics, economic development, and culture.

Profound insights arise only in debate, with a possibility of counterargument, only when there is a possibility of expressing not only correct ideas but also dubious ideas.

You can't sit on two chairs at once.

In 1947 I defended my thesis on nuclear physics, and in 1948 I was included in a group of research scientists whose task was to develop nuclear weapons.

I could not stop something I knew was wrong and terrible. I had an awful sense of powerlessness.

I regard the death penalty as a savage and immoral institution that undermines the moral and legal foundations of society.

Sometimes all we have to do is to trust. Let go of things is an easy job but to stay with a strong heart full of trust is even much more important then all .

Religion does not care about your purpose or determination

Brazil, I'm totally obsessed. I've been going since I was 17, and the first time I went, I fell in love with it.

Morality is good, and is accepted of God, as far as it goes; but the difficulty is, it does not go far enough.

We are sent into the world, like Jesus, to serve. For this is the natural expression of our love for our neighbors. We love. We go. We serve.

Beyond the natural numbers, addition, multiplication, and mathematical induction are intuitively clear.

The whole universe is change and life itself is but what you deem it

There was really nothing shocking in what Brigitte did, what was provocative was her natural sensuality.

There are two types of claims: those based on hard numbers and those based on slippery numbers.

Can I be blunt? Yes. Can I be diplomatic? Yes. Can I concoct a mixture of vinegar and honey when the circumstances warrant? Yes.