Some hold that acts are the outcome of both Exertion and Necessity. Some hold that acts originate from Time, Exertion, and Nature. Some hold that of the three, one only is the cause. Some hold that all three combined are the cause.
पौरुषं कर्म दैवं च कालवृत्तिस्वभावतः। त्रयमेतत् पृथग्भूतमविवेकं तु केचन॥