Bhagavad Gita Verse 11, Chapter 17

aphalakaankshibhiryaajnau vidhidrishto ya ijyate |
yashtavyameveti manaha samaadhaaya sa saattvikaha || 11 ||
 
That which is performed by one without expectation of result, according to scripture, with a mental resolve of duty alone, such sacrifice is saattvic.
 
aphalakaankshibhihi : one without expectation of result
yaajnaha : sacrifice
vidhidrishtaha : according to scripture
yaha : that which
ijyate : performed
yashtavyam : duty
eva : alone
iti : in this manner
manaha : mind
samaadhaaya : resolve
saha : that
saattvikaha : is saattvic
 
So far, Shri Krishna revealed that the type of food we can reveal texture of our faith. He now lists the types of yajnya, the types of sacrificial rituals for worship, so that we can analyze the texture of our faith through them. Yajnyas are extremely elaborate rituals, but can be reduced to three basic components - the offering, the flame and the result. The person conducting the ritual uses items such as oil or butter as an offering to the deity. The deity is represented by the flame that consumes the offering. A yajnya is typically performed with a specific goal or result in mind, such as a longer life, marriage, children, prosperity and so on.
 
How does this matter to us in today’s day and age? Symbolically, yajnya refers to all of our interactions with any entity or object in this world, and comprises of the very same components. First, the offering is the effort we put in to perform an action. This action could be something we perform at our job, for example. Second, the flame represents the recipient of our action. Lastly, the recipient responds to our action in the form of a result, which could e something tangible such as money, or intangible, such as goodwill towards us.
 
As we saw earlier, three people can perform the same action with three different attitudes of sattva, rajas and tamas. Here, Shri Krishna describes the attitude of a saatvic person. Such a person performs his action driven by a sense of duty to a higher ideal, without any selfish desire. The higher ideal could be service of one’s country, for instance. There is no expectation of any result from the recipient of the action. Furthermore, the action is performed in line with a set of selfless laws, such as the law of a country, humanitarian laws, or laws that have come from scripture.