My favourite words are possibilities, opportunities and curiosity. I think if you are curious, you create opportunities, and then if you open the doors, you create possibilities.

England is the country where I learned my profession. They are the ones that trained me, they are the ones that believed in me.

A photograph can make you feel so many different things. When you look at war photographs of Vietnam, or something similar, it makes you feel anguish and sadness and pain. Then in other moments, when you look at Jackie Kennedy walking down Fifth Avenue, that makes you feel glory and richness.

It's a choice - there are two different sorts of photographer: those obsessed with the technicalities and those obsessed by the subject.

It is a very great mistake, and a very common one, even for well-read persons, to adopt the idea that the progress of the human race in the science of government, in the arts of civilization and refinement, and in the establishment of morality and religion, has been constantly and steadily towards improvement and perfection.

My views as an individual ought not to be confused with my views as a scientist - the minute you try to mingle God and science, you get into trouble. Metaphysics has its place, and science has its place; don't mix the two.

The issue of the environment as seen by Pope Francis is not a matter of purely scientific or, indeed, theological debate: it involves economic and political views on how the world's poor can be brought out of poverty while protecting the environment.

Unlike scientism, science in the true sense of the word is open to unbiased investigation of any existing phenomena.