because it is beautiful

Henri Poincaré

in 

Science and Method

copy fromhttp://www.goodreads.com/quotes/279030-the-scientist-does-not-study-nature-because-it-is-useful

“The scientist does not study nature because it is useful to do so.
He studies it because he takes pleasure in it,
and he takes pleasure in it because it is beautiful.
If nature were not beautiful it would not be worth knowing,
and life would not be worth living.
I am not speaking, of course, of the beauty which strikes the senses, of the beauty of qualities and appearances.
I am far from despising this, but it has nothing to do with science.
What I mean is that more intimate beauty which comes from the harmonious order of its parts, and which a pure intelligence can grasp.”