Doubt is the key to knowledge. 怀疑是知识的钥匙。 The greatest test of courage on earth is to bear defeat without losing heart. 世界上对勇气的最大考验是忍受失败而不丧失信心。 Variety is the spice of life.
To be both a speaker of words and a doer of deeds. 既当演说家，又做实干家。 Life is real, life is earnest. 人生真实，人生诚挚。 Life would be too smooth if it had no rubs in it.
Life is the art of drawing sufficient conclusions form insufficient premises. 生活是一种艺术，要在不充足的前提下得出充足的结论。 Life is fine and enjoyable, yet you must learn to enjoy your fine life.
Life is but a hard and tortuous journey. 人生即是一段艰难曲折的旅程，人生无坦途。 Life is a horse, and either you ride it or it rides you. 人生像一匹马，你不驾驭它，它便驾驭你。
Life is a great big canvas, and you should throw all the paint on it you can.
人生是一幅大画布，你应该努力绘出绚丽多彩的画面。 Life is like music. It must be composed by ear, feeling and instinct, not by rule. 人生如一首乐曲，要用乐感，感情和直觉去谱写，不能只按乐律行事。
Life is painting a picture, not doing a sum.
生活是绘画，不是做算术。 The wealth of the mind is the only wealth. 精神的财富是唯一的财富。 You can't judge a tree by its bark. 人不可貌相。 Sharp tools make good work.
Wasting time is robbing oneself. 浪费时间就是掠夺自己。 He that promises too much means nothing. 轻诺者寡信。 He who has an art has everywhere a part. 一招鲜，吃遍天。
If you are not inside a house, you don not know about its leaking.
不在屋里，不知漏雨。(亲身经历才有体会。) It is never too late to mend. 亡羊补牢，犹未为晚。 Life is a span. 人生如朝露。 Man proposes, God disposes. 谋事在人，成事在天。
Meet plot with plot.
将计就计。 Merry meet, merry part. 好聚好散。 No fire without smoke. 无风不起浪。 Nurture passes nature. 教养胜过天性。 One is never too old to learn. 活到老，学到老。
One swallow does not make a summer.
一燕不成夏。(一花独放不是春。) Sense comes with age. 老马识途。 So many men, so many minds. Some thing is learned every time a book is opened. 开卷有益。 Strike while the iron is hot.
The car will find its way round the hill when it gets there.