《宋史·列传·卷四十三》
陛下应居安思危，审慎计议所长，一定等到事情来到然后图谋，就危险了。
陛下当居安思危，熟计所长，必待事至而后图之，殆矣。
Your Majesty should be at peace and yet think about dangers, and should consider carefully the long-term interests; if you wait until things have occurred before you deliberate, that will be dangerous.