No one can say that I do not receive anything and so there is no question of giving. The very fact that one is alive shows he is receiving from Nature and the society the very existence shows with certainty that one is receiving. Certain minimum things we have to take from the society if we have to live. Therefore the Runa concept is there in our culture, that we owe to our parents, society, Nature, Rushis, etc. as we take from them. Panca Yajna thus formalises as well as traditionalizes the life of giving. Those who have really chosen giving as life, for them giving becomes life.
If we can give more, our capacity to take also increases. For example, the more fully we breathe out, the more air we can take in. The more we are giving, the more nurturing of our existence takes place at physical, mental and intellectual levels. If we go on giving, then eternal replenishment takes place. But if the giving is stopped then stagnation takes place. Thus this rule of 'Sata haste Samahara, Sahasra Haste Sankira', is for our own development. It is said that if we keep giving to the society then the Tapaswis give their Tapas to us. No other extra penance needs to be done. Thus the service of giving to others itself becomes a Sadhana.