【为虺弗摧】〖wéi hu fú cu〗[prevent against the evils from extending their influence]

为丛驱雀留美研，

虺长成蛇姑养奸。

弗用任由外成就，

摧山搅海母国反。

小蛇不打死，大了就难办。比喻弱敌不除，必有后患。虺：小蛇。Small snake does not kill, big is difficult do. Metaphor weak enemy no annihilate, there will be later trouble. Cobras: Little snake.