Sacrifice produces rain! It is asserted by some that the smoke that rises from the sacrificial (homa) pit brings about the necessary change in the atmosphere to induce the cloud to rain.
Even subtler than this is the power of good thoughts. There is a proverb in Tamil which says that if there is one good man in the village, the entire village will be blessed with sufficient rain to ensure its prosperity. The selfish man is more concerned with destroying the prosperity of the neighbour than with building his own, for he wants to shine as a superior person, one better than the neighbor. When all are selfish, the whole atmosphere is full of vicious thought-currents; ill-will fills the whole place and the mood of destruction prevails. The very elements respond to such thought-vibrations and we have famine and pestilence.
On the other hand, if there is self-sacrificing selflessness in the heart of man, then there is prosperity. It is easy enough to see that with that selflessness in his heart, man will ever try to promote the prosperity of others. His actions will be pure and prosperity-promoting. Such pure action is divine, rooted in the imperishable, the eternal law that has created and that sustains the whole universe.
This is the law of the divine. Man should live a self-sacrificing, selfless life of service to all. Sacrifice is born of action. It is action, it is life. A life of sacrifice is therefore a full and dynamic life. Sacrifice knits knowledge and action into the fabric of divine life.