The text is as follows -

" Yogena Chittasya Padena Vacha
Malam Sharirasya Cha Vaidya Kena
Yopakarotham Pravaram Muninam
Patanjalim Pranjali Ranatosmi "

Roughly translated the meaning is as follows:-

I salute the great Master Patanjali. He taught Yoga to heal the mind. He taught Ayurveda to heal the body. He taught the Mantras for healing on all levels. I salute him again and again - may I attain freedom

This invocation to Patanjali is the introduction to the Bhoja Vritti, the commentary on the Yoga Sutras written by Raja Bhoj. It is frequently chanted at the beginning of a yoga class and before meditation. It is supposed to strengthen mental powers. Click on the Play button to play - you will feel some inner peace of mind.