"天使和魔鬼永远留在我们的心里，但其实就是我们自己会让他们存在。" is there any part from my sentence need to be correct?
for those who don't get what i mean, this is the english version before i translated to mandarin "angel & devil always stay inside us, but in the end is ourselves who makes them exist".

Question

"天使和魔鬼永远留在我们的心里，但其实就是我们自己会让他们存在。" is there any part from my sentence need to be correct?
for those who don't get what i mean, this is the english version before i translated to mandarin "angel & devil always stay inside us, but in the end is ourselves who makes them exist".

Answer

I think you try to express the causal relationship in this sentence.
Maybe you can use substantive phrase to improve it.
(之所以)天使和魔鬼永远留在我们的心里，其实是因为我们允许了他们的存在。

Answer

西方 天使 魔鬼 的概念 
應轉化為中華文化裡頭的 "善惡"概念
"在我們心裡 , 讓他們存在" 其實就是 "一個念頭"
故說 "善惡一念間"

或者 轉化為"禍福" 的概念
則寫成 "禍福無主, 實己招之"

原句有點繞口令的味道
讀者不易揣摩其真正含意
如此可以寫得更簡潔 更具中文味道

Answer

不如你用英语解释一遍，我不确定你想表达什么意思。If I do not know  what you mean correctly, any modification is meaningless.

Answer

之所以天使和魔鬼永远留在我们的心里，完全是由于我们自身的原因。

Answer

天使和魔鬼永远存在于我们的心里，而其实是我们自己让他们存在