Of men who had devoted themselves to the science of things, there are some who say that, in the production of effects, Exertion is supreme. Some learned persons hold that Destiny is supreme, and some that it is Nature which is the agent.
केचित् पुरुषकारं तु प्राहुः कर्मसु मानवाः। दैवमित्यपरे विप्राः स्वभावं भूतचिन्तकाः॥