The articles, "a", "an" and "the" are important to show which object we are talking about.

My podcast episode that explains what they are and how to use them: https://www.italki.com/en/podcast/episode/coh1dyg1vpvszcpnwaecgn

The Social Evolutionary

"Weed" or "A Weed" - a BIG difference!

1.duì yú shì jiè ér yán ，nǐ shì yí gè rén ；dàn shì duì yú mǒu gè rén ，nǐ shì tā de zhěng gè shì jiè 。
对于世界而言，你是一个人；但是对于某个人，你是他的整个世界。 
2.méi yǒu rén zhí dé nǐ liú lèi ，zhí dé ràng nǐ zhè me zuò de rén ，bú huì ràng nǐ kū qì 。
没有人值得你流泪，值得让你这么做的人，不会让你哭泣。
 3.bú yào wèi nà xiē bú yuàn zài nǐ shēn shàng huā fèi shí jiān de rén ér làng fèi nǐ de shí jiān 。
不要为那些不愿在你身上花费时间的人而浪费你的时间。
 4.bú yào zháo jí ，zuì hǎo de zǒng huì zài zuì bù jīng yì de shí hou chū xiàn 。 不要着急，最好的总会在最不经意的时候出现 

version:
1.To the world you may be one person,but to one person you may be the world. 2.No man or woman is worth your tears,and the one who is ,won't make you cry. 3.Don't waste your time on a man/woman,who is not willing to waste their time on you. 4.Don't try so hard,the best things come when you least expect them to