Yōga Sūtra 3.19

प्रत्ययस्य परचित्तज्ञानम्।

pratyayasya paracittajñānam।

[प्रत्ययस्य पर चित्त ज्ञानम्।
pratyayasya = by the faith; para = others; citta = consciousness; jñānam = knowledge;]

By (samyama of) faith one gains the knowledge of other's consciousness.