1. Your understanding of what you read and hear is, to a very large degree, determined by your vocabulary, so improve your vocabulary daily. (Zig Ziglar)
2. Vocabulary is a matter of word-building as well as word-using. (David Crystal)
3. Words are important. If you cannot say what you mean, you will never mean what you say. And you should always mean what you say. (from the film 'The Last Emperor')
4. You can't meet friends if you stay at home all the time. In the same way, you can't build up a vocabulary if you never meet any new words. And to meet them you must read. The more you read the better. (Rudolf Flesch)
5. Words are, in my not-so-humble opinion, our most inexhaustible source of magic. (Dumbledore)