《金史·列传·卷四十六》
受到贫困的逼迫，盗贼就会产生。如果宋人暗中招募，以厚利引诱，让他们充当向导，待我不备突然入侵，则内有叛民，外有劲敌，就不容易战胜了，这是五不可。
贫穷之迫，盗所由生，如宋人阴为招募，诱以厚利，使为乡导，伺我不虞突而入寇，则内有叛民，外有勍敌，未易图之，其不可五也。
Driven by poverty, bandits will be produced. If the Song recruit secretly, entice them with high profits, and let them serve as guides to invade suddenly when we are not prepared, then there will be rebels inside and strong enemies outside, so it will not be easy to conquer. This is the fifth reason.