Mahabharata 6.28.27

प्रशान्तमनसं ह्येनं योगिनं सुखमुत्तमम्उपैति शान्तरजसं ब्रह्मभूतमकल्मषम्

praśāntamanasaṃ hyenaṃ yoginaṃ sukhamuttamamupaiti śāntarajasaṃ brahmabhūtamakalmaṣam

Our plain-language meaning of this verse is waiting for scholar review.