Without the armour of mindfulness a man is easy target for the defilements, just as on a battlefield someone who has lost his armour is easily shot by his enemies. A mind which is not protected by mindfulness is as helpless as a sightless man walking over uneven ground without a guide. Loss of mindfulness is why people engage in useless pursuits, do not care for their own true interests, and remain unalarmed in the presence of things which actually menace their welfare. And, as a herdsman runs after his scattered cows, so mindfulness runs after the scattered virtues, such as morality, etc, wherever they can be found.
– From: Conze. 1959. Buddhist Scriptures. Penguin.