The Vedas have truth for their object. Truth has the mastering of the senses for its object. The subjugation of the senses has charity for its object. Charity has penance for its object.
वेदस्योपनिषत् सत्यं सत्यस्यापनिषद् दमः। दमस्योपनिषद् दानं दानस्योपनिषत् तपः॥