A friend is a second self.朋友是另一个我。

Diligence is the mother of good luck.刻苦是成功之母。

Never too old （or late） to learn.学到老，学不了。

Do as the Romans do.入乡随俗。

Knowledge is power.知识就是力量。

Love me, love my dog.爱屋及乌。

Look before you leap.三思而后行。

More haste, less speed.欲速则不达。

Diamond cuts diamond.强中自有强中手。

A life without a friend is a life without a sun.人生没有朋友，犹如生活没有阳光。

A thousand mile trip begins with one step.千里之行，始于足下。

Actions speak louder than words.事实胜于雄辩。

A bad beginning makes a bad ending.不善始者不善终。

A bad thing never dies.遗臭万年。

A bird in the hand is worth than two in the bush.一鸟在手胜过双鸟在林。

Practice makes perfect.熟能生巧。

Reading is to the mind while exercise to the body.读书健脑，运动强身。

A man becomes learned by asking questions.问问题长知识。

这些谚语不仅丰富了英语表达，还在日常学习和生活中提供了深刻的道理。希望这些谚语对你有所帮助。