We know that we are happy when our mind is peaceful, and unhappy when it is not. It is therefore clear that our happiness depends upon our having a peaceful mind and not on good external conditions. Even if our external conditions are poor, if we maintain a peaceful mind all the time we shall always be happy.
Geshe Kelsang Gyatso (2011). “Modern Buddhism: The Path of Compassion and Wisdom - Volume 1 Sutra”, p.33, Tharpa Publications US
