战国策
卷三十二 ‧ 宋、卫策齐攻宋宋使臧子索救于荆
齐攻宋，宋使臧子索救于荆。荆王大说，许救甚劝。臧子忧而反。其御曰：“索救而得，有忧色，何也？”臧子曰：“宋小而齐大。夫救于小宋而恶于大齐，此王之所忧也；而荆王说甚，必以坚我。我坚而齐敝，荆之利也。”臧子乃归。齐王果攻，拔宋五城，而荆王不至。
Good sentences
- Take copper as a reference, you can be dressed; Taking the past as a mirror, we can know the rise and fall; Taking people as a lesson can make you aware of the gains and losses.
- Even the wise can make mistakes; A fool thinks a thousand times, and he will get one.