Sisapavanasutta 3.2

3.2

Etañhi, bhikkhave, atthasaṃhitaṃ etaṃ ādibrahmacariyakaṃ etaṃ nibbidāya virāgāya nirodhāya upasamāya abhiññāya sambodhāya nibbānāya saṃvattati;

Because it’s beneficial and relevant to the fundamentals of the spiritual life. It leads to disillusionment, dispassion, cessation, peace, insight, awakening, and extinguishment.