Easier said than done:知易行難(Google翻譯)
依照這樣的邏輯,知難行易應該可以翻成:Easier done than said.
在網路上看到的例句如下: 哲學主張:“知難行易”。彌留之際,孫中山提到國事的遺言是:“和平……奮鬥……救中國!”His philosophy is "it's easier to do than know." When he was dying, his last sentence was"peace, strive, save China."