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。

A good thing is known when it is lost.

失去才知珍贵。

A man does not live only by bread.

人不仅是靠面包过日子的。

An ill life, an ill end.

恶有恶报。

Actions speak louder than words.

事实胜于雄辩。

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.

好问则博。

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。希望这些对你有所帮助!如果有更多具体需求或想了解更多相关谚语，请随时告诉我。