कृषिगौरक्ष्यवाणिज्यं वैश्यकर्म स्वभावजम्।
परिचर्यात्मकं कर्म शूद्रस्यापि स्वभावजम्।।18.44।।
।।18.44।। कृषि? गौपालन तथा वाणिज्य ये वैश्य के स्वाभाविक कर्म हैं? और शूद्र का स्वाभाविक कर्म है परिचर्या अर्थात् सेवा करना।।
The natural duties allocated to the vaisyas or agricultural, mercantile class are: 1) krishi or farming. 2) go-raksa or cow raising and cow protecting 3) vanijyam or acts of commerce and trade endorsed by the Vedic scriptures. The natural duties of sudras or worker class are amenable service to the upper 3 classes. Thus by defining the duties of the four classes in Vedic culture the necessary performance of prescribed Vedic activities and the appropriate participation of each of the four classes is implied. For example in yagna or ritualistic performance of propitiation and worship the Brahmins will perform the ceremony, the ksatriya will donate wealth, the vaisyas will supply the ingredients such as ghee or clarified butter and cow products, the sudras will serve the ksatriyas and vaisyas. The Brahmins being naturally endowed with sattva guna the mode of goodness are allotted with samah or self control of the mind which bestows the purity required to perform Vedic rituals and ceremonies. Although qualified for initiation this was not allocated to ksatriya and vaisyas due to they having a preponderance of raja guna mode of passion and tama guna mode of ignorance which is not compatible with samah. The Brahmins exemplify by example the teachings of the Vedic scriptures instructing others the proper way to live a human existence according to the status of life they are in. The ksatriyas duty is to righteously govern and protect the citizens of the country. The vaisyas duty is cow protection and cultivating food for the population. The sudras duty is to do all the menial services for a fair compensation, necessary for the upper three classes to discharge their duties expediently and efficiently.