A bad conscience is a snake in one's heart.

做贼心虚。

A bad workman quarrels with his tools.

拙匠常怨工具差。

A bird in the hand is worth two in the bush.

双鸟在林不如一鸟在手。

A bird is known by its note, and a man by his deeds.

鸟以鸣声为人所知，人以行为著称。

Education is the door to freedom.

教育是通向自由之门。

Challenges make life interesting.

挑战使生活变得有趣。

Difficulties make life worth living.

困难让生活更有价值。

Early mistakes are the seeds of future trouble.

早期的错误可以酿成日后的麻烦。

A friend in need is a friend indeed.

患难见真情。

Strength alone knows conflict, weakness is below even defeat, and is born vanquished.

只有强者才懂得斗争；弱者甚至失败都不够资格，而是生来就是被征服的。

这些名言警句不仅有助于学生掌握英语知识，还能激励他们在学习和生活中不断进步。建议学生将这些名言铭记于心，并在适当的场合加以引用，以增强自己的表达力和思考力。