Our mind, when there’s no one looking after it, is like a child without parents to look after it — an orphaned child, a child with no protector. A person without a protector suffers, and it’s the same with the mind. If it’s not trained, if its views aren’t straightened out into right views, it’s put to a lot of difficulties.
– Ajahn Chah, Theravada, Thai Forest Tradition.