BG 18.28-30
Discordant, vulgar, stubborn, cheating, malicious, indolent, despairful, procrastinating, that actor is called dark. The division of Reason and of firmness also, threefold according to the qualities, hear thou related, unreservedly and severally, O Dhananjaya. That which knoweth energy and abstinence, what ought to be done and what ought not to be done, fear and fearlessness, bondage and liberation, that Reason is pure, O Pârtha.