一把刀的鋒刃很不容易越過(guò)；因此智者說(shuō)得救之道是困難的.

原話是It’s not the cutting sharpness of the razor’s edge that is the idea,but its extreme narrowness,the idea that the spiritual path is very narrow,very hard to stay on,extremely easy to fall off of.
其實(shí)原意是指行走在刀鋒上的人,如果想保持平衡時(shí)十分困難的.可能經(jīng)過(guò)多次翻譯的緣故,所以有了歧義.尼采有一段類似的話,——“人是一根繩索,連接在動(dòng)物與超人之間---繩索懸于深淵上方.往彼端去是危險(xiǎn)的,停在半途是危險(xiǎn)的,向后瞧望也是危險(xiǎn)的,戰(zhàn)栗或不前進(jìn)都是危險(xiǎn)的.”
維特根斯坦受尼采的影響較大,不排除他這段話是從尼采的思想中引申出來(lái)的.