句子使用is the source of…表达核心原因，句型简单而有力。
Only by observing the world with care can you truly see it; only by living with care can you truly understand life.
A person who does not work hard cannot even be reached when others try to help.
Even in a cold world, there is always a kind warmth that stays beside you and gently lights up your life.
Labor is the source of all happiness and beautiful things in the world.
You are a doctor when I am seriously hurt, yet you stay like a child, talking with me in dreams.
If you want to become excellent, you must accept challenges; if you want to improve quickly, you must actively seek them.
Laziness is like rust—it consumes the body more than hard work. Frequently used keys always shine.
Without loss, there is no gain. When sacrifice is needed, we never hesitate.
In loneliness, learn to comfort yourself, become independent, say goodbye to dependence, and to your weak self.
Constant change is not innovation; lack of direction is not progress; destruction without construction is not development.
Worrying too much about the future is wrong. In the chain of fate, the only thing we can grasp is the present.
Life feels empty and dull only to those who live it in a dull and tasteless way.
People either do not truly believe in their own death, or unconsciously believe they will never die.
Those who overly attribute luck to their own intelligence and strategy often end up with unfortunate results.
Some people say they will no longer add men as friends; before adding them, they seem normal, but afterward they appear completely different.
用心看世界，才能看得真切；用心去生活，才能活得明白。
一个不努力的人，别人想拉你一把，也找不到你的手在哪里。
即使世界如此冷漠，也总会有一份温暖守护在你身边，温柔你的生命。
劳动是世界上一切欢乐与美好事物的源泉。
你是医生，在我重伤时，你却像孩子一样陪我说着梦话。
想变得优秀，就必须接受挑战；想更快优秀，就要主动寻找挑战。
懒惰像生锈一样，比操劳更消耗身体；常用的钥匙，总是闪亮的。
没有失去，就没有获得；在需要付出的时候，我们从不犹豫。
在孤独时学会安慰自己，学会独立，告别依赖，对软弱的自己说再见。
变来变去不叫创新，没有方向不叫进步，只破不立不叫发展。
过度担忧未来是错误的，在命运的链条中，我们唯一能把握的只有现在。
生活只有在平淡无味的人眼中才显得空虚乏味。
人要么不相信自己的死亡，要么在潜意识中确信自己不会死亡。
凡是过于将幸运归功于自己聪明与谋略的人，结局往往不会太好。
有些人说不再添加异性好友，添加时还是人，添加之后却变了模样。