Happiness is like a butterfly; the more you chase it, the more it will elude you. But if you turn your attention to other things, it will come and sit softly on your shoulder.
The most important thing in life is to stop saying 'I wish' and start saying 'I will.'
The coal industry must evolve to meet modern environmental standards, or it will become obsolete.
The study of black holes has led us to the edge of our understanding, where the known laws of physics break down and new theories must emerge.