A good ornithologist should be able to distinguish birds by their air as well as by their colours and shape.
When I hear fine music I am afraid I do not enough attend to it. I cannot help stopping and filling my mind with the sweetness of the sounds.
These circumstances, trivial as they may seem, have their importance; since without them we could never have come to any certainty.
In the great chain of causes and effects, no single fact can be considered in isolation.
You must know the big ideas in the big disciplines and use them routinely — all of them, not just a few.
The most dangerous worldview is the worldview of those who have not viewed the world.