It's better to get mugged than to live a life of fear.
There is a great satisfaction in building good tools for other people to use.
The technologies which have had the most profound effects on human life are usually simple.
You ask: what is the meaning or purpose of life? I can only answer with another question: do you think we are wise enough to read God's mind?
Einstein in real life was not only a great politician and a great philosopher. He was also a great observer of the human comedy, with a robust sense of humor.
A good scientist is a person with original ideas. A good engineer is a person who makes a design that works with as few original ideas as possible. There are no prima donnas in engineering.
The question that will decide our destiny is not whether we shall expand into space. It is: shall we be one species or a million? A million species will not exhaust the ecological niches that are awaiting the arrival of intelligence.