Man attains to a superior colour by pious deeds. Unable to acquire a superior colour for such acquisition is highly difficult, a person, by doing sinful deeds only kills himself.
वर्णोत्कर्षमवाप्नोति नरः पुण्येन कर्मणा। दुर्लभं तमलब्ध्वा हि हन्यात् पापेन कर्मणा॥