The diversity of the phenomena of nature is so great, and the treasures hidden in the heavens so rich, precisely in order that the human mind shall never be lacking in fresh nourishment.
自然现象的多样性如此之大,天空中隐藏的宝藏如此丰富,正是为了使人类的思想永远不乏新鲜的滋养。
The only person you should try to be better than is the person you were yesterday.
Every book is a journey.