进退触藩

Explanation: Forward and back there are obstacles that dilemma. A phrase from the "easy big strong": "ram fan touch the sheep, can not be returned, not then." Brief Account Shu: "back that retreat, then go into that." Ram, ram. Fan, fence. Qing Wei Yuan "to raise canal chapter on": "retreat touch Fan, namely, when the security measures, flea charts Fortunately, no regret umbilical bite." Also as a "retreat touch fencing." "After the real history of Zen," the fourth four-back: "retreat touch fencing, in fact, the difficulties."