Here is the Sanskrit anuvad, Hindi anuvad, and English translation of Moksha-Sanyasa Yoga Chapter 18, Verse 18.18.
ज्ञानं ज्ञेयं परिज्ञाता त्रिविधा कर्मचोदना । करणं कर्म कर्तेति त्रिविधः कर्मसंग्रहः ॥ १८.१८ ॥
ज्ञाता, ज्ञान, और ज्ञेय यह तीन प्रकार की कर्म-प्रेरणा है और कर्ता, करण तथा क्रिया यह तीन प्रकार का कर्म-संग्रह है ।
rjuna, there are three instigators (stimuli) of action in this world namely, knowledge itself (that which is perceived through the senses and interpreted by a being through his mind and intellect), the object of knowledge (that which a being uses to receive his knowledge and ultimately gains his intelligence from after he perceives the useful information through his senses), and of course the knower (who is the SELF or the JIVATMAN – that which receives and is affected by the stimulus to perform the action of learning). The three factors involved in the accomplishment of any task are the senses, the actual work and the performer of the work.