Maybe God wants us to meet a few wrong people before meeting the right one so that when we finally meet the right person

Maybe God wants us to meet a few wrong people before meeting the right one so that when we finally meet the right person,we will know how to be grateful for that gift.
When the door of happiness closes,another opens,but often times we look so long at the closed door that we don't see the one which has been opened for us
It's true that we don't know what we've got until we lose it,but it's also true that we don't know what we've been missing until it arrives
或许是上帝的安排,在最终找到知音之前,我们总要遇到一些不尽如意的人,只有这样,我们才能对知音这份礼物充满感激之情.
一道幸福之门关闭时,另一扇就会打开.我们经常太多太多地只看见关闭的门,而对开启的门却熟视无睹.
无疑,一件东西只有失去时,我们才会懂得其真正的价值.同样,一件东西在得到之前,我们并没有意识到它的缺少.
急,急,急,请帮忙画一下句子成分,