The cause of happiness and the solution to our problems do not lie in knowledge of material things. Happiness and suffering are states of mind, and so their main causes cannot be found outside the mind. If we want to be truly happy and free from suffering, we must learn how to control our mind.

Modern Buddhism: The Path of Compassion and Wisdom - Volume 1 Sutra (ed. Tharpa Publications US, 2011) - ISBN: 9781906665852