How to practise SN 15.14 to attain enlightenment?

I read the following on the internet, where a person either claimed to be a Noble One or, otherwise, was exhorting with a Lion's Roar the path to stream-entry or possibly Full Enlightenment. The hairs and goose bumps stood up upon my skin as I read with awe the following Lion's Roar: > A worldling without a knowledge of past lives would not see that as > "incest". > > [SN 15.14](https://suttacentral.net/sn15.14/en/sujato) > > > At Sāvatthī. “Mendicants, transmigration has no known beginning. It’s not easy to find a sentient being who in all this long time has > not previously been your mother. Why is that? Transmigration has > no known beginning. This is quite enough for you to become > disillusioned, dispassionate, and freed regarding all conditions.” My question is how does believing "*It’s not easy to find a sentient being who in all this long time has not previously been your mother*" result in becoming disillusioned, dispassionate and freed regarding all conditions?