"We must uncover whatever is cloaking the heart. Mindfulness and wisdom must be focused on whatever is dark and obscure, taking that as the target for investigation. Where exactly are the sadness and gloom? They are conditions of the heart that we know. It's just like when darkness and light contact our eyes. We perceive darkness as dark, but the 'one who knows' the darkness is not in the dark. Light and darkness are known; sadness and cheerfulness are known."
-- Ajahn Maha Boowa