Imagination will often carry us to worlds that never were. But without it we go nowhere.

The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.

Science is a way of thinking much more than it is a body of knowledge.

Personally, I would be delighted if there were a life after death, especially if it permitted me to continue to learn about this world and others, if it gave me a chance to discover how history turns out.

For small creatures such as we the vastness is bearable only through love.