The Bodhicitta Prayer

སེམས་བསྐྱེད་སྨོན་ལམ།

བྱང་ཆུབ་སེམས་མཆོག་རིན་པོ་ཆེ། །

May the sublime and precious bodhicitta

མ་སྐྱེས་པ་རྣམས་སྐྱེས་གྱུར་ཅིག །

Arise in those in whom it has not arisen.

སྐྱེས་པ་ཉམས་པ་མེད་པར་ཡང་། །

Where it has arisen, may it never decline

གོང་ནས་གོང་དུ་འཕེལ་བར་ཤོག །

But grow and flourish more and more.

- Attributed to Nagarjuna

Pronunciation Guide

བྱང་ཆུབ་སེམས་མཆོག་རིན་པོ་ཆེ། །	changchub semchok rinpoché
མ་སྐྱེས་པ་རྣམས་སྐྱེ་གྱུར་ཅིག །	ma kyépa nam kyé gyur chik
སྐྱེས་པ་ཉམས་པ་མེད་པར་ཡང་ །	kyépa nyampa may par yang
གོང་ནས་གོང་དུ་འཕེལ་བར་ཤོག །	gong nay gong du pelwar shok

OR

བྱང་ཆུབ་སེམས་མཆོག་རིན་པོ་ཆེ། །	changchub semchok rinpoché
མ་སྐྱེས་པ་རྣམས་སྐྱེ་གྱུར་ཅིག །	ma kyépa nam kyé gyur chik
སྐྱེས་པ་ཉམས་པ་མེད་པ་དང༌། །	kyépa nyampa maypa dang
གོང་ནས་གོང་དུ་འཕེལ་བར་ཤོག །	gong nay gong du pelwar shok

This very well-known prayer is recited in many Tibetan traditions and has been translated many times in slightly different ways. In case you prefer to chant it slightly differently than the above, here are some other options from reliable sources:

Adam Pearcey of Lotsawa House

O precious and sublime bodhicitta,
May it arise in those in whom it has not arisen,
May it never decline where it has arisen,
But go on increasing, further and further!

(Source: Lotsawa House)

Padmakara Translation Group in The Nectar of Manjushri's Speech

May bodhichitta, precious and sublime,

Arise where it has not yet come to be.

And where it has arisen may it never fail,

But grow and increase ever more and more.

(Source)

Andreas Kretchmar

May the precious and supreme bodhicitta

Arise in those in whom it has not yet arisen;

And where it has arisen may it not decrease

But ever increase more and more.

Eric Pema Kunsang

May the precious and sublime awakened mind

Arise in those where it has not arisen.

Where it has arisen may it never wane

But continue to increase forever more.

Bodhicitta - The altruistic thought to seek enlightenment for the sake of all sentient beings. It is said to have two aspects: compassion aimed at sentient beings and their problems and the wisdom of enlightenment as the solution. Skt बोधिचित्त  Tib བྱང་ཆུབ་སེམས།  Ch 菩提心  

Go to the page with the definition of 'bodhicitta'