Karika 31

स्वां स्वां प्रतिपद्यन्ते परस्पराकूतहेतुकां वृत्तिम्।
पुरुषार्थ एव हेतुर्न केनचित्कार्यते करणम्॥ ३१॥

Translation by Henry Thomas Colebrooke (1837): The instruments perform their respective functions, incited by mutual invitation. The soul's purpose is the motive; an instrument is wrought by none.

Translation by John Davies (1881): They (the internal organs) perform each his own separate function, which is caused to act by a mutual impulse. The advantage of the soul is their cause of action. An organ is not caused to act by any one.

Translation by Ganganath Jha (1896): They (the organs) operate towards the performation of their respective functions, due to mutual impulse. The purpose of the Spirit supplies the motive; by nothing (else) is an organ caused to act.

Translation by Nandalal Sinha (1915): The Instruments enter into their respective modifications to which they are incited by mutual desire. The purpose of Puruṣa is the only (cause of the activity of the Instruments). By none whatever is an Instrument made to act.

Translation by Har Dutt Sharma (1933): The organs perform their respective functions incited by mutual impulse. The motive (of their action) is the goal of the Spirit; an organ is not caused to function by anyone.

Translation by Radhanath Phukan (1960): The organs (both internal and external) discharge their respective functions prompted by a mutual common impulse; that common impulse is the enjoyment, and final release thereby, of the Puruṣa; the organs are not made to work by any one.

Translation by Swami Virupakshananda (1995): The organs enter into their respective modifications being incited by mutual impulse. The purpose of the Spirit is the sole motive (for the activity of the organs). By none whatsoever is an organ made to act.

Translation by G. Srinivasan (recent): The cyclic vortex or spherical oscillator is kept in continuous interactive exchange up to the very end (limit) only by the nuclear or core potential developed by the mutual exchange of internally motivated and triggered self similar and self organized impulse or force and there is no other external potential cause.