Lies can never changes fact. 謊言終究是謊言。

Let the cat out of the bag. 洩漏天機。

Let sleeping dogs lie. 別惹麻煩。

Let bygones be bygones. 過去的就讓它過去吧。

Learn to walk before you run. 先學走，再學跑。

Learn not and know not. 不學無術。

Learning makes a good man better and ill man worse. 好人越學越好，壞人越學越壞。

Learn and live. 活著，為了學習。

Knowledge makes humble, ignorance makes proud. 博學使人謙遜，無知使人驕傲。

Knowledge is power. 知識就是力量。