a simple truth meaning in English

粗浅的道理

It was a simple truth that struck me like lightning
这个简单的真理如电击般震撼了我。
How stupid of her not to understand such a simple truth
连那么简单的道理都不懂得，她真蠢啊！
It is a simple truth that human relations between people have deteriorated so far that dialogue , understanding , friendship - all these are impossible
一个简单地事实是人们的关系已经十分恶化，以至于对话、理解、友谊? ?所有的这些都不可能了。