ज्ञानं ज्ञेयं परिज्ञाता त्रिविधा कर्मचोदना।
करणं कर्म कर्तेति त्रिविधः कर्मसंग्रहः।।18.18।।
18.18 Knowledge, the object the knowledge and the knower-this is the threefold inducement to action. The comprehension of actions comes under three heads-the instruments, the object and the subject.
18.18 (i) Knowledge means this knowledge about the acts which ought to be performed. (ii) The object of knowledge is the act which ought to be performed. (iii) The knower is the person who knows that act. The meaning is that the injunction to do acts, like Jyotistoma etc., is a combination of knowledge, object of knowledge, and the knower. Among these, action itself, which is the object of knowledge, is briefly described as threefold - these being the instrument, action and the agent. The instrument forms the materials etc., which are the means. The action consists of the sacrifice etc. The agent is the performer.
Jnaanam jneyam parijnaataa trividhaa karmachodanaa; Karanam karma karteti trividhah karmasangrahah.
jñānam—knowledge; jñeyam—the object of knowledge; parijñātā—the knower; tri-vidhā—three factors; karma-chodanā—factors that induce action; karaṇam—the instrumens of action; karma—the act; kartā—the doer; iti—thus; tri-vidhaḥ—threefold; karma-saṅgrahaḥ—constituents of action