Sacrifice is Yagnya, which is the actual ritual where you start a fire and the priest chants a mantra and the participants put their offering into the fire. Usually the offering is ghee, grain or pieces of wood, anything inflammable. When you offer your Ahuti into the fire, the fire shoots up. The belief is that the Fire God has been propitiated and blessed the participants. This external ritual represents something that we should be practicing internally, which is basically a shift from the attitude of taking, grabbing, and aggrandising to giving, contributing, serving, and adding value to others. The Havan Kund, the Fire, represents the goal that you are working for, such as an organisation or the nation. All the employees of an organisation go to work and each employee offers his or her ability and expertise for the wellbeing of the organisation. So the Ahuti is their talent, their expertise, their ability. If all the employees offer their ability for the wellbeing of the organisation, the fire shoots up or the profit potential of the organisation is kindled. The organisation makes huge profits and these profits are naturally shared with the employees, shareholders and stakeholders. Everybody benefits. But if each one goes to grab from the organisation, very soon the organisation will go bankrupt and everybody suffers. So, the basic premise is to make this shift in thinking. Sacrifice is to fix a goal or an ideal beyond your selfish, self-centred interest and work dedicatedly towards that goal. If you work in a spirit of Yagnya or sacrifice, you achieve success, become a happy person and grow spiritually.