It is the source of all evil.

它是万恶之源泉。

youdao

Idleness is the source of all evil.

懒惰为万恶之源。

youdao

The source of nearly all the evil and unhappiness of this world is selfishness.

自私是世上几乎所有罪恶与不幸的源头。

youdao

The source of nearly all the evil and unhappiness of this world is selfishness.

自私是世上几乎所有罪恶与不幸的源头。

youdao