A room is not a room without natural light.
To any artist, worthy of the name, all in nature is beautiful, because his eyes, fearlessly accepting all exterior truth, read there, as in an open book, all the inner truth.
Actions are right in proportion as they tend to promote happiness; wrong as they tend to produce the reverse of happiness.
Sometimes the simplest ideas make the best stories.
In the realm of theoretical physics, every discovery opens up new questions and challenges.