All suffering comes from the wish for your own happiness.
Perfect Buddhas are born from the thought to help others.
Therefore exchange your own happiness
For the suffering of others—
This is the practice of bodhisattvas.
— Ngulchu Gyalsay Thogme Zangpo (also transliterated as Togmay Sangpo, Togme, Thogmey) in The Thirty-seven Practices of Bodhisattvas, translated from the Tibetan by Ruth Sonam. Available in Jampa Tegchok‘s Transforming Adversity into Joy and Courage: An Explanation of the Thirty-seven Practices of Bodhisattvas, edited by Thubten Chodron, (Ithaca, New York: Snow Lion Publications, 1995), p. 165. Cited by Traleg Kyabgon in The Practice of Lojong: Cultivating Compassion Through Training the Mind, (Boston, Massachusetts: Shambhala Publications, 2007), p. 66.
"All suffering comes from the wish for your own happiness."
All of our sufferings, without an exception, derive from the wish to please but ourselves;
While the thoughts and the actions that benefit others conceive and give birth to supreme Buddhahood.
Thus in exchange for our selfish desires and shameful neglect of our suffering kin,
Replace thoughts of self with concern for all others – the Sons of the Buddhas all practise this way.
— Available on A View on Buddhism