The source of understanding is within oneself and there is no comprehension of the world and your relationship to it without deep self-knowledge.

理解的源泉是在自身之中，没有深刻的自知。就没有对世界和你与世界的关系的理解。

youdao

We often commend the Germans for their deep self-reflection on their past but seldom carefully study their way of thinking nor analyze their methods.

我们经常赞赏德国人自觉深刻的历史反思，却很少认真细致地研究分析其思路和方法。

youdao

He was his old self again, except for the deep furrows that marked the corners of his mouth.

他又是他的老样子了，只是多了些深深的刻在他的嘴角的皱纹。

《柯林斯英汉双解大词典》

He tested the free-diving self-propelled submersible - one of only two in existence at the time - on increasingly deep dives off the California coast.

VOA: standard.2010.06.21

And the abiding memory is of deep, deep self-loathing.

BBC: Boris Johnson 'would like to be PM'

Abstinence only education relies too much on the fairy tale that all our hormone-addled teenagers and young adults have deep reserves of self discipline.

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"Self-harm needs a lot of time-intensive work - there are a lot of deep issues behind the self-harm and that needs a therapeutic approach and that needs money, " she said.

BBC: Depression, self-harm generic shot posed by model