Whatever you see, inquire into what it really is. Contemplate the good people in the world. Contemplate the evil ones too. Take a penetrating look at the rich and the powerful; the destitute and poverty-stricken. When you see a child, a senior citizen or a young man or woman, investigate the meaning of age. Everything is fuel for inquiry. This is how you cultivate the mind.
— Ajahn Chah, Food for the Heart