Om Sahana Vavatu Sahanau Bhunaktu
Tejas Vinavati Tamastuma vidhwishavahai
Om Shanti Shanti Shantihi
(Shanti mantra: meaning May He protect both of us(teacher and student). May He nourish both of us. May we both acquire the capacity (to study and understand the scriptures). May our study be brilliant. May we not argue with each other. Om peace, peace, peace.
Purnamadah purnamidam purnaat purnamudachyate
purnasya purnaamadaya purnameva vashishyate.
(From Ishavasya Upanishad, meaning Everything/That/This is complete; Whether you add or subract, It always remains complete)